Greenhouse gases

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

Approval and Promulgation of Implementation Plans; Montana; Butte PM10

The Environmental Protection Agency (EPA) is proposing to fully approve 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: 
Monday, April 19, 2021 - 4:00am

Approval and Promulgation of Implementation Plans; State of Utah; Salt Lake City and Provo, Utah PM2.5

On November 6, 2020, the Environmental Protection Agency (EPA) published a notice of proposed rulemaking to approve redesignation of the Salt Lake City, Utah and Provo, Utah nonattainment areas (NAAs) to attainment for the 2006 24-hour fine particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 microns (PM<INF>2.5</INF>) National Ambient Air Quality Standard (NAAQS), and also acted on multiple related State Implementation Plan (SIP) submissions.

Publication Date: 
Tuesday, April 6, 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 proposing to approve 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: 
Thursday, April 1, 2021 - 4:00am

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 proposing to approve 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. Utah submitted the base year emissions inventories to meet, in part, the nonattainment requirements for Marginal ozone nonattainment areas under the 2015 8- hour ozone NAAQS.

Publication Date: 
Thursday, April 1, 2021 - 4:00am

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

The Environmental Protection Agency (EPA) is proposing 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 the Clean Air Act (CAA).

Publication Date: 
Monday, March 15, 2021 - 4:00am

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

The Environmental Protection Agency (EPA) is approving and conditionally approving State Implementation Plan (SIP) revisions submitted by the State of Colorado on May 31, 2017, May 14, 2018 and May 8, 2019. The revisions are to Colorado Air Quality Control Commission (Commission or AQCC) Regulation Number 7 (Reg. 7). The revisions to Reg.

Publication Date: 
Wednesday, February 24, 2021 - 4:00am

Air Quality State Implementation Plans; Approval and Promulgation of Implementation Plans; Utah; Infrastructure Requirements for the 2015 Ozone National Ambient Air Quality Standards; Correction

On June 1, 2020, the Environmental Protection Agency (EPA) published a rulemaking proposing to approve multiple elements of the infrastructure SIP requirements for the 2015 ozone NAAQS for the State of Utah, while taking no action on three infrastructure elements (85 FR 33052). On September 16, 2020, we published a rulemaking taking final action on the proposal. The final rulemaking incorrectly stated that there were no comments received during the public comment period for the proposed rulemaking (85 FR 57731).

Publication Date: 
Tuesday, February 23, 2021 - 4:00am

Control of Air Pollution From Airplanes and Airplane Engines: GHG Emission Standards and Test Procedures

The Environmental Protection Agency (EPA) is adopting greenhouse gas (GHG) emission standards applicable to certain classes of engines used by certain civil subsonic jet airplanes with a maximum takeoff mass greater than 5,700 kilograms and by certain civil larger subsonic propeller-driven airplanes with turboprop engines having a maximum takeoff mass greater than 8,618 kilograms.

Publication Date: 
Monday, January 11, 2021 - 4:00am

Determination of Attainment by the Attainment Date for the Salt Lake City, Utah and Provo, Utah 2006 24-Hour PM2.5

The Environmental Protection Agency (EPA) has determined that the Salt Lake City, Utah and Provo, Utah Serious nonattainment areas (NAAs) attained the 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) National Ambient Air Quality Standards (NAAQS) by the December 31, 2019 ``Serious'' area attainment date. The determination is based on quality-assured, quality-controlled and certified ambient air quality monitoring data from 2017 through 2019, available in the EPA's Air Quality System (AQS) database.

Publication Date: 
Tuesday, November 17, 2020 - 4:00am