Extending the Reporting Deadline Under the Greenhouse Gas Reporting Rule for Reporting Year 2025 to March 10, 2027 2026-20982 | Environmental Protection Agency | Final rule | Oct 14 |
Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines 2026-14112 | Environmental Protection Agency | Proposed rule | Jul 14 |
Technical Guidelines for the Production of Regenerative Agricultural Biofuel Feedstocks 2026-13092 | Energy and Environmental Policy Office | Final rule | Jun 29 |
Air Plan Approval; North Dakota; Approval of Air Quality Implementation Plans; Regional Haze State Implementation Plan; Regional Haze Five Year Progress Report and Nitrogen Oxides Best Available Retrofit Technology Determination for Coal Creek Station for the First Implementation Period 2026-04649 | Environmental Protection Agency | Final rule | Mar 10 |
Extending the Reporting Deadline Under the Greenhouse Gas Reporting Rule for 2025 2026-03995 | Environmental Protection Agency | Final rule | Feb 27 |
Rescission of the Greenhouse Gas Endangerment Finding and Motor Vehicle Greenhouse Gas Emission Standards Under the Clean Air Act 2026-03157 · significant | Environmental Protection Agency | Final rule | Feb 18 |
Air Plan Disapproval; Colorado; Regional Haze Plan for the Second Implementation Period 2026-01413 | Environmental Protection Agency | Final rule | Jan 26 |
Air Plan Approval; Colorado; Revisions to Colorado Procedural Rules and Common Provisions Regulation 2025-24141 | Environmental Protection Agency | Final rule | Jan 2 |
Air Plan Approval; Montana; Regional Haze Plan for the Second Implementation Period 2025-21340 | Environmental Protection Agency | Final rule | Nov 28, 2025 |
Approval and Promulgation of Implementation Plans; State of Utah; Salt Lake City and Provo, Utah PM2.5 Redesignations to Attainment and Utah State Implementation Plan Revisions 2025-20352 | Environmental Protection Agency | Final rule | Nov 19, 2025 |
Reconsideration of the Greenhouse Gas Reporting Program 2025-17923 | Environmental Protection Agency | Proposed rule | Sep 16, 2025 |
Air Plan Approval; Montana; Regional Haze Plan for the Second Implementation Period; Prong 4 (Visibility) for the 2015 8-Hour Ozone National Ambient Air Quality Standard 2025-17499 | Environmental Protection Agency | Proposed rule | Sep 11, 2025 |
Air Plan Approval; Wyoming; R-35 Wyoming Air Quality Standards and Regulations Rule Package 2025-17486 | Environmental Protection Agency | Final rule | Sep 11, 2025 |
Air Plan Approval; South Dakota; Regional Haze Plan for the Second Implementation Period 2025-16468 | Environmental Protection Agency | Final rule | Aug 28, 2025 |
Air Plan Approval; Wyoming; Revisions to Regional Haze State Implementation Plan 2025-14983 | Environmental Protection Agency | Final rule | Aug 7, 2025 |
Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards 2025-14572 · significant | Environmental Protection Agency | Proposed rule | Aug 1, 2025 |
Air Plan Partial Approval and Partial Disapproval; Colorado; Regional Haze Plan for the Second Implementation Period 2025-13342 | Environmental Protection Agency | Proposed rule | Jul 16, 2025 |
Air Plan Approval; State of Utah; Utah PM2.5 State Implementation Plan Revisions 2025-13337 | Environmental Protection Agency | Proposed rule | Jul 16, 2025 |
Air Plan Approval; Colorado; Interim Final Determination to Stay and Defer Sanctions in the Denver Metro/North Front Range 2008 Ozone Nonattainment Area 2025-11266 | Environmental Protection Agency | Final rule | Jun 18, 2025 |
Air Plan Approval; Colorado; Serious Attainment Plan RACT Requirements for the 2008 8-Hour Ozone National Ambient Air Quality Standards for the Denver Metro/North Front Range Nonattainment Area 2025-11263 | Environmental Protection Agency | Proposed rule | Jun 18, 2025 |
Congressional Review Act Revocation of Waste Emissions Charge for Petroleum and Natural Gas Systems: Procedures for Facilitating Compliance, Including Netting and Exemptions 2025-08688 | Environmental Protection Agency | Final rule | May 19, 2025 |
Rescinding Reporting Requirements, Certification, Independent Verification, and DOE Review for Voluntary Greenhouse Gas Reporting 2025-08585 · significant | Energy Department | Proposed rule | May 16, 2025 |
Air Plan Approval; South Dakota; Regional Haze Plan for the Second Implementation Period 2025-08072 | Environmental Protection Agency | Proposed rule | May 14, 2025 |
Air Plan Approval; Colorado; Interim Final Determination To Stay and Defer Sanctions in the Denver Metro/North Front Range 2008 Ozone Nonattainment Area 2025-07938 | Environmental Protection Agency | Final rule | May 8, 2025 |
Air Plan Approval; Colorado; Serious Attainment Plan Contingency Measures for the 2008 8-Hour Ozone National Ambient Air Quality Standards for the Denver Metro/North Front Range Nonattainment Area 2025-07937 | Environmental Protection Agency | Proposed rule | May 8, 2025 |
Extending the Reporting Deadline Under the Greenhouse Gas Reporting Rule for 2024 Data 2025-04724 | Environmental Protection Agency | Final rule | Mar 20, 2025 |
Technical Guidelines for Climate-Smart Agriculture Crops Used as Biofuel Feedstocks 2025-00975 | Agriculture Department | Final rule | Jan 17, 2025 |
Revisions to the Federal Implementation Plan for the Billings/Laurel, Montana, Sulfur Dioxide Area 2025-00220 | Environmental Protection Agency | Final rule | Jan 17, 2025 |
Air Plan Approval; Montana; Missoula, Montana Oxygenated Fuels Program Removal, Carbon Monoxide, Limited Maintenance Plan 2025-00380 | Environmental Protection Agency | Final rule | Jan 16, 2025 |
Air Plan Approval; Revisions to Colorado Common Provisions Regulation 2024-30695 | Environmental Protection Agency | Final rule | Dec 27, 2024 |
Air Plan Partial Approval and Partial Disapproval; Wyoming; Regional Haze Plan for the Second Implementation Period 2024-27942 | Environmental Protection Agency | Final rule | Dec 2, 2024 |
Air Plan Partial Approval and Partial Disapproval; Utah; Regional Haze State Implementation Plan for the Second Implementation Period; Air Plan Disapproval; Utah; Prong 4 (Visibility) for the 2015 8-Hour Ozone National Ambient Air Quality Standard 2024-27941 | Environmental Protection Agency | Final rule | Dec 2, 2024 |
Air Plan Partial Approval and Partial Disapproval; North Dakota; Regional Haze State Implementation Plan for the Second Implementation Period 2024-27940 | Environmental Protection Agency | Final rule | Dec 2, 2024 |
Waste Emissions Charge for Petroleum and Natural Gas Systems: Procedures for Facilitating Compliance, Including Netting and Exemptions 2024-26643 | Environmental Protection Agency | Final rule | Nov 18, 2024 |
Inflation Adjustment References for Civil Monetary Penalty Amounts in Title 40 of the Code of Federal Regulations 2024-25669 | Environmental Protection Agency | Final rule | Nov 8, 2024 |
Air Plan Approval; Revisions to Colorado Common Provisions Regulation 2024-25228 | Environmental Protection Agency | Proposed rule | Oct 30, 2024 |
Air Plan Approval; Montana; Missoula, Montana Oxygenated Fuels Program Removal, Carbon Monoxide, Limited Maintenance Plan 2024-23589 | Environmental Protection Agency | Proposed rule | Oct 15, 2024 |
Revisions to the Federal Implementation Plan for the Billings/Laurel, Montana, Sulfur Dioxide Area 2024-23568 | Environmental Protection Agency | Proposed rule | Oct 15, 2024 |
Air Plan Approval; Montana; Missoula, Montana, Air Rule Revisions 2024-20997 | Environmental Protection Agency | Proposed rule | Sep 17, 2024 |
Greenhouse Gas Reporting Rule: Revisions and Confidentiality Determinations for Petroleum and Natural Gas Systems; Correction 2024-18933 | Environmental Protection Agency | Final rule | Sep 4, 2024 |
Air Plan Partial Approval and Partial Disapproval; Utah; Regional Haze State Implementation Plan for the Second Implementation Period; Air Plan Disapproval; Utah; Interstate Transport of Air Pollution for the 2015 8-Hour Ozone National Ambient Air Quality Standards 2024-18462 | Environmental Protection Agency | Proposed rule | Aug 19, 2024 |
Air Plan Approval; North Dakota; Approval of Air Quality Implementation Plans; Regional Haze State Implementation Plan; Regional Haze Five Year Progress Report and Nitrogen Oxides Best Available Retrofit Technology Determination for Coal Creek Station for the First Implementation Period 2024-17471 | Environmental Protection Agency | Proposed rule | Aug 14, 2024 |
Air Plan Approval and Conditional Approval; Colorado; Regulation Numbers 7 and 21 and RACT Requirements for the 2008 8-Hour Ozone Standard for the Denver Metro/North Front Range Nonattainment Area 2024-17091 | Environmental Protection Agency | Proposed rule | Aug 6, 2024 |
Air Plan Partial Approval and Partial Disapproval; Wyoming; Regional Haze Plan for the Second Implementation Period 2024-16718 | Environmental Protection Agency | Proposed rule | Aug 1, 2024 |
Clean Air Act Reclassification; Colorado; Reclassification of the Denver Metro/North Front Range 2015 Ozone Nonattainment Area to Serious 2024-16123 | Environmental Protection Agency | Final rule | Jul 24, 2024 |
Air Plan Approval; Colorado; 2017 Base Year Inventory and Emission Statement Rule Marginal Nonattainment Requirements, Revisions to Regulation 3 2024-15953 | Environmental Protection Agency | Final rule | Jul 22, 2024 |
Air Plan Partial Approval and Partial Disapproval; North Dakota; Regional Haze State Implementation Plan for the Second Implementation Period 2024-14761 | Environmental Protection Agency | Proposed rule | Jul 10, 2024 |
Air Plan Approval; State of Utah; Utah State Implementation Plan Revisions 2024-14136 | Environmental Protection Agency | Final rule | Jul 1, 2024 |
Greenhouse Gas Reporting Rule: Revisions and Confidentiality Determinations for Petroleum and Natural Gas Systems 2024-08988 · significant | Environmental Protection Agency | Final rule | May 14, 2024 |
Revisions and Confidentiality Determinations for Data Elements Under the Greenhouse Gas Reporting Rule 2024-07413 · significant | Environmental Protection Agency | Final rule | Apr 25, 2024 |
Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles-Phase 3 2024-06809 | Environmental Protection Agency | Final rule | Apr 22, 2024 |
Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles 2024-06214 | Environmental Protection Agency | Final rule | Apr 18, 2024 |
Air Plan Approval; Colorado; 2017 Base Year Inventory and Emission Statement Rule Marginal Nonattainment Requirements, Revisions to Regulation 3 2024-07584 | Environmental Protection Agency | Proposed rule | Apr 10, 2024 |
Air Plan Approval; Wyoming; Revisions to Regional Haze State Implementation Plan 2024-07414 | Environmental Protection Agency | Proposed rule | Apr 10, 2024 |
Waste Emissions Charge for Petroleum and Natural Gas Systems 2024-00938 | Environmental Protection Agency | Proposed rule | Jan 26, 2024 |