{"schema_version":1,"layer":"air","reviewed_on":"2026-10-28","coverage_note":"Generator counts documented in selected permits, not a complete state or national count. A construction or operation permit does not prove equipment installation, operating hours, measured emissions or a data center opening.","items":[{"id":"air-il-prime-construction-20261025","kind":"permit_context","state_codes":["il"],"subject":"Illinois Prime construction permit and startup dependent operating clock","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed.","fields":{"il_prime_permit_basis":{"value":"Illinois EPA construction permit24090003, facility031440AWZ, issued July15,2025 after application received September3,2024.","source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed."},"status":{"value":"approved","source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed."},"il_site_boundary":{"value":"1600 East Higgins Road, Elk Grove Village, Cook County. Dallas address is permittee mailing address, not emission source location.","source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed."},"il_permitted_equipment":{"value":"Construction authorization lists39 diesel emergency generators, each3250kW and4656BHP, with20 equipped with diesel particulate filters. Permitted equipment is not proof of installation or operation.","source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed."},"il_startup_clock":{"value":"Condition1c allows operation for12months after initial startup and longer if operating permit application is submitted within12months of initial startup. Issue date is not startup date or automatic calendar expiry.","source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed."},"il_emission_scope":{"value":"Conditions1a and1b describe requested NOx and CO restrictions for major source applicability. Numerical limits in remaining conditions were not reviewed.","source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed."},"actual_operation":{"value":null,"source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed.","unknown_reason":"Startup, operating authorization and exact record match have not been verified."},"atlas_record_id":{"value":null,"source_ids":["il-prime-24090003-20261025"],"locator":"Permit page1 heading, equipment description and conditions1a through1c; page2 applicability","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed.","unknown_reason":"Startup, operating authorization and exact record match have not been verified."}}},{"id":"air-il-aurora-cyrusone-preliminary-20260317","kind":"permit_context","state_codes":["il"],"subject":"Aurora CyrusOne preliminary air permit and source inventory","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed.","fields":{"aurora_preliminary_basis":{"value":"Illinois EPA document is labeled Preliminary Draft CAAPP permit17060002 for source043407ACW. CoverMarch17,2026, application receivedJanuary15,2026, issued and expiration datesTBD. Boilerplate granting language does not establish issuance.","source_ids":["il-aurora-cyrusone-preliminary-caapp"],"locator":"Preliminary cover; printed1,3,15,16,39","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed."},"status":{"value":"proposed","source_ids":["il-aurora-cyrusone-preliminary-caapp"],"locator":"Preliminary cover; printed1,3,15,16,39","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed."},"aurora_source_office_boundary":{"value":"Source is2905E.DiehlRoad,Aurora,DuPageCounty. Owner and permittee address2850NorthHarwoodStreetSuite2200,Dallas is administrative contact, not the computing source. No exact building or wholeCHI1throughCHI3 association adopted.","source_ids":["il-aurora-cyrusone-preliminary-caapp"],"locator":"Preliminary cover; printed1,3,15,16,39","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed."},"aurora_draft_inventory_boundary":{"value":"Printed39,physical40 summary lists91diesel emergency engines from1250to2750kW. This draft source inventory is not proof of91new units, installed inventory, current operation, IT capacity or actual emissions. No arithmetic total of mixed engine ratings inferred.","source_ids":["il-aurora-cyrusone-preliminary-caapp"],"locator":"Preliminary cover; printed1,3,15,16,39","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed."},"aurora_condition_boundary":{"value":"Reviewed printed15and16 describe engine groups and draft opacity observation requirements. Full emission limits, exceptions, authorization history and effective conditions remain unreviewed; no final legal compliance or operating-hours allowance inferred.","source_ids":["il-aurora-cyrusone-preliminary-caapp"],"locator":"Preliminary cover; printed1,3,15,16,39","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed."},"atlas_record_id":{"value":null,"source_ids":["il-aurora-cyrusone-preliminary-caapp"],"locator":"Preliminary cover; printed1,3,15,16,39","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed.","unknown_reason":"Draft and bounded review do not establish exact Native scope or measured outcome."},"actual_emissions":{"value":null,"source_ids":["il-aurora-cyrusone-preliminary-caapp"],"locator":"Preliminary cover; printed1,3,15,16,39","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed.","unknown_reason":"Draft and bounded review do not establish exact Native scope or measured outcome."}}},{"id":"air-il-wooddale-cyrusone-modeling-20250515","kind":"permit_context","state_codes":["il"],"subject":"Wood Dale dated proposed generator and modeling context","scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","fields":{"wooddale_model_basis":{"value":"Agency memorandum datedJanuary6,2025 and revisedMay15,2025 describes construction application24060010,source043120AEZ submittedJune6,2024. This historical modeling review is not independently inspected final permit issuance or current project status.","source_ids":["il-wooddale-cyrusone-modeling-memo"],"scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","locator":"Memo physical1; selected methodology physical2"},"status":{"value":"historical","source_ids":["il-wooddale-cyrusone-modeling-memo"],"scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","locator":"Memo physical1; selected methodology physical2"},"wooddale_inventory_boundary":{"value":"Application requested44new emergency generators supporting two proposed Wood Dale buildings:42at2250kW with6800gallon integral tanks and2at1250kW with3800gallon tanks. Requested equipment is not installed or operating inventory, IT load, actual fuel use or a whole campus total.","source_ids":["il-wooddale-cyrusone-modeling-memo"],"scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","locator":"Memo physical1; selected methodology physical2"},"wooddale_address_boundary":{"value":"Memo identifies460and480BrynMawrAvenue,WoodDale. These are distinct from Aurora source043407ACW and Dallas administrative offices. Published UTM centering coordinates are not adopted as roof or parcel coordinates; no exact Native phase join.","source_ids":["il-wooddale-cyrusone-modeling-memo"],"scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","locator":"Memo physical1; selected methodology physical2"},"wooddale_model_boundary":{"value":"Modeling and proposed permitted emission increases are not measured ambient concentrations or actual emissions. InitialSeptember2024analysis andMarch2025addendum are distinct. Following methodology text refers to CookCounty; no county assignment is adopted from that unverified reference.","source_ids":["il-wooddale-cyrusone-modeling-memo"],"scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","locator":"Memo physical1; selected methodology physical2"},"atlas_record_id":{"value":null,"source_ids":["il-wooddale-cyrusone-modeling-memo"],"scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","locator":"Memo physical1; selected methodology physical2","unknown_reason":"Historical modeling memorandum does not establish exact Native scope or measured emissions."},"actual_emissions":{"value":null,"source_ids":["il-wooddale-cyrusone-modeling-memo"],"scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","locator":"Memo physical1; selected methodology physical2","unknown_reason":"Historical modeling memorandum does not establish exact Native scope or measured emissions."}}},{"id":"air-egrid-state-2023-il","subject":"Illinois historical2023 electricity-generation emissions","kind":"emissions_context","state_codes":["il"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","fields":{"status":{"value":"historical","source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 Data Year column"},"egrid_report_year":{"value":"2023","source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 YEAR column"},"egrid_state_fips":{"value":"17","source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 FIPSST column"},"egrid_state_basis":{"value":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 labels,codes,units and review scope"},"egrid_annual_net_generation":{"value":177690286.567,"source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 IL row 17, STNGENAN (State annual net generation (MWh))","unit":"MWh","measurement_role":"reported_egrid_annual_net_generation","source_token":"177690286.567"},"egrid_annual_nox_emissions":{"value":14983.831,"source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 IL row 17, STNOXAN (State annual NOx emissions (tons))","unit":"tons","measurement_role":"reported_egrid_annual_nox_emissions","source_token":"14983.831"},"egrid_annual_so2_emissions":{"value":23974.718,"source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 IL row 17, STSO2AN (State annual SO2 emissions (tons))","unit":"tons","measurement_role":"reported_egrid_annual_so2_emissions","source_token":"23974.718000000001"},"egrid_annual_co2_emissions":{"value":41908695.063,"source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 IL row 17, STCO2AN (State annual CO2 emissions (tons))","unit":"tons","measurement_role":"reported_egrid_annual_co2_emissions","source_token":"41908695.063000001"},"egrid_nox_total_output_rate":{"value":0.169,"source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 IL row 17, STNOXRTA (State annual NOx total output emission rate (lb/MWh))","unit":"lb per MWh","measurement_role":"reported_egrid_nox_total_output_rate","source_token":"0.16900000000000001"},"egrid_so2_total_output_rate":{"value":0.27,"source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 IL row 17, STSO2RTA (State annual SO2 total output emission rate (lb/MWh))","unit":"lb per MWh","measurement_role":"reported_egrid_so2_total_output_rate","source_token":"0.27"},"egrid_co2_total_output_rate":{"value":471.705,"source_ids":["epa-egrid2023-states-rev2"],"scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.","locator":"ST23 IL row 17, STCO2RTA (State annual CO2 total output emission rate (lb/MWh))","unit":"lb per MWh","measurement_role":"reported_egrid_co2_total_output_rate","source_token":"471.70499999999998"},"egrid_annual_ch4_emissions_lb":{"value":7376287.158,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STCH4AN (State annual CH4 emissions (lbs))","unit":"lbs","measurement_role":"reported_egrid_annual_ch4_emissions","source_token":"7376287.1579999998"},"egrid_annual_co2e_emissions":{"value":42151319.601,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STCO2EQA (State annual CO2 equivalent emissions (tons))","unit":"tons","measurement_role":"reported_egrid_annual_co2e_emissions","source_token":"42151319.601000004"},"egrid_annual_n2o_emissions_lb":{"value":1051747.324,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STN2OAN (State annual N2O emissions (lbs))","unit":"lbs","measurement_role":"reported_egrid_annual_n2o_emissions","source_token":"1051747.324"},"egrid_ozone_season_nox_total_output_rate":{"value":0.178,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STNOXRTO (State ozone season NOx total output emission rate (lb/MWh))","unit":"lb per MWh","measurement_role":"reported_egrid_ozone_season_nox_total_output_rate","source_token":"0.17799999999999999"},"egrid_extended_basis":{"value":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 field labels,report year and annual-versus-ozone-season units"},"egrid_ozone_season_nox_emissions":{"value":6665.668,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STNOXOZ (State ozone season NOx emissions (tons))","unit":"tons","measurement_role":"reported_egrid_ozone_season_nox_emissions","source_token":"6665.6679999999997"},"egrid_co2e_total_output_rate":{"value":474.436,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STC2ERTA (State annual CO2 equivalent total output emission rate (lb/MWh))","unit":"lb per MWh","measurement_role":"reported_egrid_co2e_total_output_rate","source_token":"474.43599999999998"},"egrid_ch4_total_output_rate":{"value":0.042,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STCH4RTA (State annual CH4 total output emission rate (lb/MWh))","unit":"lb per MWh","measurement_role":"reported_egrid_ch4_total_output_rate","source_token":"4.2000000000000003E-2"},"egrid_n2o_total_output_rate":{"value":0.006,"source_ids":["epa-egrid2023-states-rev2"],"scope":"Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.","locator":"ST23 IL row 17, STN2ORTA (State annual N2O total output emission rate (lb/MWh))","unit":"lb per MWh","measurement_role":"reported_egrid_n2o_total_output_rate","source_token":"6.0000000000000001E-3"}}},{"id":"air-eia-state-emissions-2025-il","kind":"emissions_context","subject":"Illinois historical power and useful thermal emissions2025 and2024","state_codes":["il"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","fields":{"status":{"value":"historical","source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 years2025 and2024"},"eia_emissions_basis":{"value":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 header and methodological notes"},"eia_emissions_co2_2025":{"value":47699.0,"source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 Illinois row;co2;Year 2025","source_token":"47,699","unit":"thousand metric tons","measurement_role":"agency_estimated_generation_and_useful_thermal_emissions"},"eia_emissions_co2_2024":{"value":42894.0,"source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 Illinois row;co2;Year 2024","source_token":"42,894","unit":"thousand metric tons","measurement_role":"agency_estimated_generation_and_useful_thermal_emissions"},"eia_emissions_so2_2025":{"value":32.0,"source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 Illinois row;so2;Year 2025","source_token":"32","unit":"thousand metric tons","measurement_role":"agency_estimated_generation_and_useful_thermal_emissions"},"eia_emissions_so2_2024":{"value":28.0,"source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 Illinois row;so2;Year 2024","source_token":"28","unit":"thousand metric tons","measurement_role":"agency_estimated_generation_and_useful_thermal_emissions"},"eia_emissions_nox_2025":{"value":21.0,"source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 Illinois row;nox;Year 2025","source_token":"21","unit":"thousand metric tons","measurement_role":"agency_estimated_generation_and_useful_thermal_emissions"},"eia_emissions_nox_2024":{"value":18.0,"source_ids":["eia-epa2025-state-emissions"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.","locator":"Table9.5 Illinois row;nox;Year 2024","source_token":"18","unit":"thousand metric tons","measurement_role":"agency_estimated_generation_and_useful_thermal_emissions"}}}],"sources":{"il-prime-24090003-20261025":{"url":"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf","title":"Prime Data Centers Illinois construction permit24090003","publisher":"Illinois Environmental Protection Agency","published_on":"2025-07-15","date_note":"Issue date printed on page1; retrieval is not startup date.","scope":"Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed.","checked_at":"2026-10-25T17:10:56.660118+00:00","sha256":"27e55b1fbb208ed762df192f3ae17f7160721b81e16077d5b51eef5e7da7c1f2","tier":"A","establishes_status":["approved"]},"il-aurora-cyrusone-preliminary-caapp":{"url":"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253","title":"CyrusOne Aurora preliminary draft CAAPP permit17060002","publisher":"Illinois Environmental Protection Agency","published_on":null,"date_note":"Cover labels Preliminary Draft March17,2026; application receivedJanuary15,2026 and issued/expiryTBD. Exact public posting date and final issuance unknown.","scope":"Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed.","checked_at":"2026-10-26T03:25:24.827076+00:00","sha256":"f4d2e057b1bb31d6f31a51f40769458341894ac7d77230adf49bf3b7a2772489","tier":"A","establishes_status":["proposed"]},"il-wooddale-cyrusone-modeling-memo":{"url":"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf","title":"CyrusOne Wood Dale air modeling memorandum","publisher":"Illinois Environmental Protection Agency","published_on":null,"date_note":"MemoJanuary6,2025 revisedMay15,2025; applicationJune6,2024, initialmodelSeptember20,2024 andaddendumMarch25,2025. Exact posting and finalpermitissuance unknown.","scope":"Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.","checked_at":"2026-10-26T03:55:11.975929+00:00","sha256":"ffcdcfd8f9c3574eae895a14d5f559455e56b71e97fd1232c7a5d16f0450c9c1","tier":"A","establishes_status":["historical"]},"epa-egrid2023-states-rev2":{"url":"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx","title":"EPA eGRID2023 revision2 original workbook ST23 state emissions,generation and total output rates","publisher":"U.S. Environmental Protection Agency","published_on":null,"date_note":"Exact workbook publication day not established;2025-06 path is a storage folder,not an exact publication date.2023 is report year,not retrieval year.","checked_at":"2026-10-27T21:05:24.064631+00:00","sha256":"895cd81dd8662406189ad8adf5a2578dcb362cdb5cff7cca81b10ee6bd2447c6","raw_path":"/Users/shaunwilson/Documents/Data Centers Atlas/build/cache/layers-20261023/epa-egrid2023-data-rev2.bin","tier":"A","scope":"EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Download index identifies eGRID2023 revision2;only workbook metadata/shared strings/ST23 entries read,no whole-archive extraction.","establishes_status":["historical"]},"eia-epa2025-state-emissions":{"url":"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html","publisher":"U.S. Energy Information Administration","title":"Electric Power Annual Table9.5 state power and CHP emissions2025 and2024","published_on":"2026-10-21","checked_at":"2026-10-28T02:40:42.051795+00:00","sha256":"36e6dbf2164041a56f6985a5fcac8357791d95eb82545bfc542aea095c38d5dd","raw_path":"/Users/shaunwilson/Documents/Data Centers Atlas/build/cache/layers-20261023/eia-epa2025-state-emissions-20261028.html","tier":"A","establishes_status":["historical"],"scope":"EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins."}},"details":[{"id":"air-il-prime-construction-20261025","html":"<article><h3>Illinois Prime construction permit and startup dependent operating clock</h3><p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed.</p><dl class=\"layer-fields\"><dt>Il prime permit basis</dt><dd>Illinois EPA construction permit24090003, facility031440AWZ, issued July15,2025 after application received September3,2024.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd><dt>Status</dt><dd>approved<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd><dt>Il site boundary</dt><dd>1600 East Higgins Road, Elk Grove Village, Cook County. Dallas address is permittee mailing address, not emission source location.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd><dt>Il permitted equipment</dt><dd>Construction authorization lists39 diesel emergency generators, each3250kW and4656BHP, with20 equipped with diesel particulate filters. Permitted equipment is not proof of installation or operation.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd><dt>Il startup clock</dt><dd>Condition1c allows operation for12months after initial startup and longer if operating permit application is submitted within12months of initial startup. Issue date is not startup date or automatic calendar expiry.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd><dt>Il emission scope</dt><dd>Conditions1a and1b describe requested NOx and CO restrictions for major source applicability. Numerical limits in remaining conditions were not reviewed.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd><dt>Actual operation</dt><dd><span class=\"layer-empty\">Not established</span><span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd><dt>Atlas record id</dt><dd><span class=\"layer-empty\">Not established</span><span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/24090003.pdf\">Illinois Environmental Protection Agency</a>. Source: July 15, 2025. Checked: October 25, 2026.</span> <p class=\"layer-scope\">Only pages1 and2 of issued construction permit reviewed. Remaining conditions, operating permit, startup records and exact Atlas association not reviewed. Locator: Permit page1 heading, equipment description and conditions1a through1c; page2 applicability.</p></dd></dl></article>"},{"id":"air-il-aurora-cyrusone-preliminary-20260317","html":"<article><h3>Aurora CyrusOne preliminary air permit and source inventory</h3><p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed.</p><dl class=\"layer-fields\"><dt>Aurora preliminary basis</dt><dd>Illinois EPA document is labeled Preliminary Draft CAAPP permit17060002 for source043407ACW. CoverMarch17,2026, application receivedJanuary15,2026, issued and expiration datesTBD. Boilerplate granting language does not establish issuance.<span class=\"layer-source\"><a href=\"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed. Locator: Preliminary cover; printed1,3,15,16,39.</p></dd><dt>Status</dt><dd>proposed<span class=\"layer-source\"><a href=\"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed. Locator: Preliminary cover; printed1,3,15,16,39.</p></dd><dt>Aurora source office boundary</dt><dd>Source is2905E.DiehlRoad,Aurora,DuPageCounty. Owner and permittee address2850NorthHarwoodStreetSuite2200,Dallas is administrative contact, not the computing source. No exact building or wholeCHI1throughCHI3 association adopted.<span class=\"layer-source\"><a href=\"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed. Locator: Preliminary cover; printed1,3,15,16,39.</p></dd><dt>Aurora draft inventory boundary</dt><dd>Printed39,physical40 summary lists91diesel emergency engines from1250to2750kW. This draft source inventory is not proof of91new units, installed inventory, current operation, IT capacity or actual emissions. No arithmetic total of mixed engine ratings inferred.<span class=\"layer-source\"><a href=\"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed. Locator: Preliminary cover; printed1,3,15,16,39.</p></dd><dt>Aurora condition boundary</dt><dd>Reviewed printed15and16 describe engine groups and draft opacity observation requirements. Full emission limits, exceptions, authorization history and effective conditions remain unreviewed; no final legal compliance or operating-hours allowance inferred.<span class=\"layer-source\"><a href=\"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed. Locator: Preliminary cover; printed1,3,15,16,39.</p></dd><dt>Atlas record id</dt><dd><span class=\"layer-empty\">Not established</span><span class=\"layer-source\"><a href=\"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed. Locator: Preliminary cover; printed1,3,15,16,39.</p></dd><dt>Actual emissions</dt><dd><span class=\"layer-empty\">Not established</span><span class=\"layer-source\"><a href=\"https://webapps.illinois.gov/EPA/WebSiteApi/api/PublicNotices/GetAirPermitDocument/10253\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Bounded preliminary draft review: physical pages1through4,16and17,40 text; physical40 equipment summary visually reviewed. Printed pages differ by one from physical PDF pages. No final issued permit, full condition set or exact Native campus association reviewed. Locator: Preliminary cover; printed1,3,15,16,39.</p></dd></dl></article>"},{"id":"air-il-wooddale-cyrusone-modeling-20250515","html":"<article><h3>Wood Dale dated proposed generator and modeling context</h3><p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed.</p><dl class=\"layer-fields\"><dt>Wooddale model basis</dt><dd>Agency memorandum datedJanuary6,2025 and revisedMay15,2025 describes construction application24060010,source043120AEZ submittedJune6,2024. This historical modeling review is not independently inspected final permit issuance or current project status.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed. Locator: Memo physical1; selected methodology physical2.</p></dd><dt>Status</dt><dd>historical<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed. Locator: Memo physical1; selected methodology physical2.</p></dd><dt>Wooddale inventory boundary</dt><dd>Application requested44new emergency generators supporting two proposed Wood Dale buildings:42at2250kW with6800gallon integral tanks and2at1250kW with3800gallon tanks. Requested equipment is not installed or operating inventory, IT load, actual fuel use or a whole campus total.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed. Locator: Memo physical1; selected methodology physical2.</p></dd><dt>Wooddale address boundary</dt><dd>Memo identifies460and480BrynMawrAvenue,WoodDale. These are distinct from Aurora source043407ACW and Dallas administrative offices. Published UTM centering coordinates are not adopted as roof or parcel coordinates; no exact Native phase join.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed. Locator: Memo physical1; selected methodology physical2.</p></dd><dt>Wooddale model boundary</dt><dd>Modeling and proposed permitted emission increases are not measured ambient concentrations or actual emissions. InitialSeptember2024analysis andMarch2025addendum are distinct. Following methodology text refers to CookCounty; no county assignment is adopted from that unverified reference.<span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed. Locator: Memo physical1; selected methodology physical2.</p></dd><dt>Atlas record id</dt><dd><span class=\"layer-empty\">Not established</span><span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed. Locator: Memo physical1; selected methodology physical2.</p></dd><dt>Actual emissions</dt><dd><span class=\"layer-empty\">Not established</span><span class=\"layer-source\"><a href=\"https://epa.illinois.gov/content/dam/soi/en/web/epa/topics/environmental-justice/documents/ira/ira-analyses/cyrusone-modeling-memo.pdf\">Illinois Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 26, 2026.</span> <p class=\"layer-scope\">Dated agency modeling memo first page text and image reviewed; selected following methodology text read. Full model files, final issued permit, remaining results and exact Native site association not independently reviewed. Locator: Memo physical1; selected methodology physical2.</p></dd></dl></article>"},{"id":"air-egrid-state-2023-il","html":"<article><h3>Illinois historical2023 electricity-generation emissions</h3><p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.</p><dl class=\"layer-fields\"><dt>Status</dt><dd>historical<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 Data Year column.</p></dd><dt>Egrid report year</dt><dd>2023<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 YEAR column.</p></dd><dt>Egrid state fips</dt><dd>17<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 FIPSST column.</p></dd><dt>Egrid state basis</dt><dd>EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence.<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 labels,codes,units and review scope.</p></dd><dt>Egrid annual net generation</dt><dd>177690286.57 MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 IL row 17, STNGENAN (State annual net generation (MWh)).</p></dd><dt>Egrid annual nox emissions</dt><dd>14983.83 tons<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 IL row 17, STNOXAN (State annual NOx emissions (tons)).</p></dd><dt>Egrid annual so2 emissions</dt><dd>23974.72 tons<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 IL row 17, STSO2AN (State annual SO2 emissions (tons)).</p></dd><dt>Egrid annual co2 emissions</dt><dd>41908695.06 tons<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 IL row 17, STCO2AN (State annual CO2 emissions (tons)).</p></dd><dt>Egrid nox total output rate</dt><dd>0.17 lb per MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 IL row 17, STNOXRTA (State annual NOx total output emission rate (lb/MWh)).</p></dd><dt>Egrid so2 total output rate</dt><dd>0.27 lb per MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 IL row 17, STSO2RTA (State annual SO2 total output emission rate (lb/MWh)).</p></dd><dt>Egrid co2 total output rate</dt><dd>471.70 lb per MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">EPA eGRID2023 revision2 state electricity-generation emissions context,ST23 worksheet. Historical2023,not current2026 conditions or data center facility emissions. Annual NOx,SO2 andCO2 totals in source tons are distinct from source-reported total output rates in lb/MWh;CO2 is not CO2 equivalent. Annual net generation is MWh,not installed capacity or customer use. Rates are not marginal emissions,ambient concentrations,health effects or emissions factors allocated to a data center. No tons-to-tonnes conversion,rate recomputation,facility join or causal data center inference. State generation context does not establish the mix delivered to consumers. Puerto Rico source row is outside this51state/DC review,not absence. Locator: ST23 IL row 17, STCO2RTA (State annual CO2 total output emission rate (lb/MWh)).</p></dd><dt>Egrid annual ch4 emissions lb</dt><dd>7376287.16 lbs<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STCH4AN (State annual CH4 emissions (lbs)).</p></dd><dt>Egrid annual co2e emissions</dt><dd>42151319.60 tons<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STCO2EQA (State annual CO2 equivalent emissions (tons)).</p></dd><dt>Egrid annual n2o emissions lb</dt><dd>1051747.32 lbs<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STN2OAN (State annual N2O emissions (lbs)).</p></dd><dt>Egrid ozone season nox total output rate</dt><dd>0.18 lb per MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STNOXRTO (State ozone season NOx total output emission rate (lb/MWh)).</p></dd><dt>Egrid extended basis</dt><dd>Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference.<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 field labels,report year and annual-versus-ozone-season units.</p></dd><dt>Egrid ozone season nox emissions</dt><dd>6665.67 tons<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STNOXOZ (State ozone season NOx emissions (tons)).</p></dd><dt>Egrid co2e total output rate</dt><dd>474.44 lb per MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STC2ERTA (State annual CO2 equivalent total output emission rate (lb/MWh)).</p></dd><dt>Egrid ch4 total output rate</dt><dd>0.04 lb per MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STCH4RTA (State annual CH4 total output emission rate (lb/MWh)).</p></dd><dt>Egrid n2o total output rate</dt><dd>0.01 lb per MWh<span class=\"layer-source\"><a href=\"https://www.epa.gov/system/files/documents/2025-06/egrid2023_data_rev2.xlsx\">U.S. Environmental Protection Agency</a>. Source: Publication date not stated. Checked: October 27, 2026.</span> <p class=\"layer-scope\">Historical2023 EPA eGRID ST23 source-reported CH4,N2O,CO2 equivalent and ozone-season NOx context. Annual CH4/N2O totals are source lbs;CO2 equivalent total is source tons;total output rates are lb/MWh. CO2 equivalent differs from raw CO2; no global-warming-potential factor assumed or recomputed,no pounds/tons/metric-tonne conversion. Source-defined ozone-season NOx is not full-year NOx or an ambient ozone concentration. Annual and seasonal rates and totals remain separate,not summed across scopes. No marginal,facility,health-risk or attributable data center emissions inference. Locator: ST23 IL row 17, STN2ORTA (State annual N2O total output emission rate (lb/MWh)).</p></dd></dl></article>"},{"id":"air-eia-state-emissions-2025-il","html":"<article><h3>Illinois historical power and useful thermal emissions2025 and2024</h3><p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.</p><dl class=\"layer-fields\"><dt>Status</dt><dd>historical<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 years2025 and2024.</p></dd><dt>Eia emissions basis</dt><dd>EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins.<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 header and methodological notes.</p></dd><dt>Eia emissions co2 2025</dt><dd>47699.00 thousand metric tons<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 Illinois row;co2;Year 2025.</p></dd><dt>Eia emissions co2 2024</dt><dd>42894.00 thousand metric tons<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 Illinois row;co2;Year 2024.</p></dd><dt>Eia emissions so2 2025</dt><dd>32.00 thousand metric tons<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 Illinois row;so2;Year 2025.</p></dd><dt>Eia emissions so2 2024</dt><dd>28.00 thousand metric tons<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 Illinois row;so2;Year 2024.</p></dd><dt>Eia emissions nox 2025</dt><dd>21.00 thousand metric tons<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 Illinois row;nox;Year 2025.</p></dd><dt>Eia emissions nox 2024</dt><dd>18.00 thousand metric tons<span class=\"layer-source\"><a href=\"https://www.eia.gov/electricity/annual/table.php?t=epa_09_05.html\">U.S. Energy Information Administration</a>. Source: October 21, 2026. Checked: October 28, 2026.</span> <p class=\"layer-scope\">EIA Table9.5 historical state2025 and2024 emissions estimates from energy consumption at conventional power and combined-heat-and-power plants. Includes electricity generation AND production of useful thermal output,not electricity-only emissions. Source unit is thousand metric tons,not eGRID source tons,pounds,CO2equivalent or emission intensity. Source CO2,SO2 and NOx are distinct pollutants,not summed as one climate measure. Displayed zero values may represent small values rounded to zero;no absence or zero-emissions certification. Retain displayed HTML precision;source says Excel cells provide additional precision,not adopted here. No direct eGRID trend or data center allocation,marginal emissions,ambient concentration,health risk,permit compliance,current2026 activity or Native facility joins. Locator: Table9.5 Illinois row;nox;Year 2024.</p></dd></dl></article>"}]}