Greenhouse gases

Control of Air Pollution From New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards

The Environmental Protection Agency (EPA) is finalizing a program to further reduce air pollution, including ozone and particulate matter (PM), from heavy-duty engines and vehicles across the United States. The final program includes new emission standards that are significantly more stringent and that cover a wider range of heavy-duty engine operating conditions compared to today's standards; further, the final program requires these more stringent emissions standards to be met for a longer period of when these engines operate on the road.

Publication Date: 
Tuesday, January 24, 2023 - 4:00am

Control of Air Pollution From Aircraft Engines: Emission Standards and Test Procedures

The Environmental Protection Agency (EPA) is finalizing particulate matter (PM) emission standards and test procedures applicable to certain classes of engines used by civil subsonic jet airplanes (engines with rated output of greater than 26.7 kilonewtons (kN)) to replace the existing smoke standard for those engines. The EPA is adopting these standards under our authority in the Clean Air Act (CAA).

Publication Date: 
Wednesday, November 23, 2022 - 4:00am

Air Plan Approval; Colorado; Reg 3 NSR and APEN Updates

The Environmental Protection Agency (EPA) is finalizing approval of regulatory amendments submitted by the State of Colorado on May 13, 2020. The revisions make limited amendments to the State's New Source Review (NSR) and Air Pollution Emission Notices (APEN). The EPA is taking this action pursuant to the Clean Air Act (CAA).

Publication Date: 
Tuesday, November 22, 2022 - 4:00am

Air Plan Approval; Colorado; Addressing Remanded Portions of the Previously Approved Infrastructure Requirements for the 2015 Ozone National Ambient Air Quality Standards

On January 5, 2021, the United States Court of Appeals for the Tenth Circuit granted the Environmental Protection Agency's (EPA) motion for a voluntary remand without vacatur of two parts of an EPA 2020 final rule approving Colorado's infrastructure state implementation plan (SIP) submission for the 2015 8-hour ozone national ambient air quality standards (NAAQS) (2020 final rule). In this document, EPA is taking final action to approve those two remanded parts of the 2020 final rule.

Publication Date: 
Tuesday, October 11, 2022 - 4:00am

Air Plan Approval; Montana; Revisions to Regional Haze State Implementation Plan and Partial Withdrawals to Regional Haze Federal Implementation Plan

The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Montana on March 25, 2020, addressing regional haze.

Publication Date: 
Friday, September 9, 2022 - 4:00am

Approval and Promulgation of Implementation Plans; State of Utah; Revisions to Utah Administrative Code: Environmental Quality; Title R307; Air Quality

The Environmental Protection Agency (EPA) is approving revisions to the Utah Division of Administrative Rules (DAR) submitted by the State of Utah on May 21, 2020, May 28, 2020, November 3, 2020, and November 12, 2020. The EPA is taking this action pursuant to the Clean Air Act (CAA).

Publication Date: 
Thursday, September 8, 2022 - 4:00am

Air Plan Approval; North Dakota; Removal of Exemptions to Visible Air Emissions Restrictions

The Environmental Protection Agency (EPA) is taking final action to approve a revision to North Dakota's State Implementation Plan (SIP) which it received on November 11, 2016. The revision was submitted by the North Dakota Department of Health (NDDH) in response to EPA's finding of substantial inadequacy and SIP call published on June 12, 2015 for a provision in the North Dakota SIP related to excess emissions during startup, shutdown, and malfunction (SSM) events.

Publication Date: 
Tuesday, August 2, 2022 - 4:00am

Improvements for Heavy-Duty Engine and Vehicle Test Procedures

This final rule includes corrections, clarifications, additional flexibilities, and adjustment factors to improve the Greenhouse gas Emissions Model (GEM) compliance tool for heavy-duty vehicles while more closely matching the outputs produced by the original GEM version 3.0 that was used to establish the CO<INF>2</INF> standards for Model Years 2021 and later in the 2016 Heavy-duty Phase 2 final rule. Given the nature of this rule, there will be neither significant environmental impacts nor significant economic impacts.

Publication Date: 
Thursday, July 28, 2022 - 4:00am

Approval and Promulgation of Implementation Plans; Montana; Thompson Falls PM10

The Environmental Protection Agency (EPA) is approving the Limited Maintenance Plan (LMP) submitted by the State of Montana to EPA on November 4, 2021, for the Thompson Falls Moderate nonattainment area (NAA) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM<INF>10</INF>) and concurrently redesignating the NAA to attainment for the 24-hour PM<INF>10</INF> National Ambient Air Quality Standard (NAAQS).

Publication Date: 
Wednesday, June 8, 2022 - 4:00am

Approval and Promulgation of Implementation Plans; Montana; Whitefish PM10

The Environmental Protection Agency (EPA) is approving the Limited Maintenance Plan (LMP) submitted by the State of Montana to EPA on August 6, 2021, for the Whitefish Moderate nonattainment area (NAA) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM<INF>10</INF>) and concurrently redesignating the NAA to attainment for the 24-hour PM<INF>10</INF> National Ambient Air Quality Standard (NAAQS).

Publication Date: 
Wednesday, June 8, 2022 - 4:00am

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