Greenhouse gases

Approval and Promulgation of Implementation Plans; Utah; 2017 Base Year Inventories for the 2015 8-Hour Ozone National Ambient Air Quality Standard for the Uinta Basin, Northern Wasatch Front and Southern Wasatch Front Nonattainment Areas

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of Utah. The revision fulfills the base year inventory requirement for the 2015 8- hour ozone national ambient air quality standard (NAAQS) for the Uinta Basin, Northern Wasatch Front, and Southern Wasatch Front nonattainment areas (NAAs). Utah submitted the base year emissions inventories to meet, in part, the nonattainment requirements for Marginal ozone NAAs under the 2015 8-hour ozone NAAQS.

Publication Date: 
Tuesday, July 6, 2021 - 4:00am

Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and Other Technical Amendments

The Environmental Protection Agency (EPA) is amending the test procedures for heavy-duty engines and vehicles to improve accuracy and reduce testing burden. EPA is also making other regulatory amendments concerning light-duty vehicles, heavy-duty vehicles, highway motorcycles, locomotives, marine engines, other nonroad engines and vehicles, and stationary engines. These amendments affect the certification procedures for exhaust emission standards and related requirements.

Publication Date: 
Tuesday, June 29, 2021 - 4:00am

Improvements for Heavy-Duty Engine and Vehicle Test Procedures

This notice of proposed rulemaking 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. This document supplements the proposed rule published on May 12, 2020, which included a larger set of proposed revisions to modify and improve GEM.

Publication Date: 
Tuesday, June 29, 2021 - 4:00am

Approval and Promulgation of Implementation Plans; Montana; Butte PM10

The Environmental Protection Agency (EPA) is approving the Limited Maintenance Plan (LMP) submitted by the State of Montana to EPA on March 23, 2020, for the Butte 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 redesignate the NAA to attainment for the 24-hour PM<INF>10</INF> National Ambient Air Quality Standard (NAAQS).

Publication Date: 
Friday, June 25, 2021 - 4:00am

Approval and Promulgation of Implementation Plans; Colorado; Revisions to Regulation Number 7; Aerospace, Oil and Gas, and Other RACT Requirements for 2008 8-Hour Ozone Standard for the Denver Metro/North Front Range Nonattainment Area

The Environmental Protection Agency (EPA) is proposing approval of State Implementation Plan (SIP) revisions submitted by the State of Colorado on May 14, 2018, May 8, 2019, and May 13, 2020. The revisions are to Colorado Air Quality Control Commission (Commission or AQCC) Regulation Number 7 (Reg. 7). The revisions to Reg.

Publication Date: 
Tuesday, June 22, 2021 - 4:00am

Approval and Promulgation of Implementation Plans; North Dakota; Revisions to Air Pollution Control Rules; Regional Haze

The Environmental Protection Agency (EPA) is finalizing approval on a revision to the North Dakota State Implementation Plan (SIP) submitted by the State of North Dakota on November 11, 2016 and supplemented on March 15, 2021, that addresses amendments to the regional haze provisions of the North Dakota Administrative Code (NDAC). These revisions were submitted to remove certain regional haze requirements related to Best Available Retrofit Technology (BART) in the first planning period.

Publication Date: 
Tuesday, June 8, 2021 - 4:00am

Clean Air Act New Source Review Operating Permit Program; Notice of Transfer of Permits to Wyoming Department of Environmental Quality

The EPA is proposing to grant Wyoming Department of Environmental Quality's (WDEQ) August 21, 2020 request to transfer to the State administrative authority over two federal permits that were issued by the EPA on June 26, 1973 under the federal new source review (NSR) permitting program. In addition, the EPA is proposing to agree with WDEQ's analysis in its August 21, 2020 letter demonstrating that the current Wyoming regulations still meet the requirements of the federal NSR permitting program. This action is proposing to transfer the 1973 federally issued permits to Wyoming.

Publication Date: 
Friday, May 28, 2021 - 4:00am

Approval and Promulgation of Implementation Plans; Utah; Source Category Exemptions

The Environmental Protection Agency (EPA) is taking final action to approve the State of Utah's Source Category Exemptions Revisions as submitted on November 5, 2019. The EPA is taking this action pursuant to section 110 of the Clean Air Act (CAA).

Publication Date: 
Thursday, May 27, 2021 - 4:00am

Approval and Promulgation of Implementation Plans; State of Utah; Logan, Utah-Idaho PM2.5

The Environmental Protection Agency (EPA) is approving the request by the State of Utah to redesignate the Logan, Utah-Idaho (UT- ID) nonattainment area (NAA) (Logan NAA) to attainment status for the 2006 24-hour National Ambient Air Quality Standards (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 microns (PM<INF>2.5</INF>), and approving related State Implementation Plan (SIP) revisions submitted by the State of Utah on November 5, 2019, and January 13, 2020.

Publication Date: 
Wednesday, May 19, 2021 - 4:00am

Approval and Promulgation of Implementation Plans; South Dakota; Revisions to Air Rules of South Dakota

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of South Dakota on January 3, 2020 that revises the Administrative Rules of South Dakota (ARSD), Air Pollution Control Program, updating the chapter pertaining to definitions. The EPA is taking this action pursuant to the Clean Air Act (CAA).

Publication Date: 
Monday, May 10, 2021 - 4:00am

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