National parks

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

Air Quality Designations for the 2010 Sulfur Dioxide (SO2

The Environmental Protection Agency (EPA) is withdrawing the initial nonattainment designation for portions of the Outagamie County, Wisconsin, area for the 2010 sulfur dioxide (SO<INF>2</INF>) primary National Ambient Air Quality Standard (NAAQS) and is finalizing a designation of attainment/unclassifiable for the area. The EPA Administrator signed an action on December 21, 2020, to designate certain areas in the United States (U.S.) for the 2010 SO<INF>2</INF> NAAQS, including the Outagamie County area.

Publication Date: 
Wednesday, April 14, 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

Air Quality Designations for the 2010 Primary Sulfur Dioxide (SO2

This final rule establishes the initial air quality designations for certain areas in the United States (U.S.) for the 2010 primary sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS). The Environmental Protection Agency (EPA) is designating the areas as either nonattainment, attainment/ unclassifiable, or unclassifiable.

Publication Date: 
Friday, March 26, 2021 - 4:00am

Designation of Areas for Air Quality Planning Purposes; Indiana; Redesignation of the Southwest Indiana Sulfur Dioxide Nonattainment Area

In accordance with the Clean Air Act (CAA), the Environmental Protection Agency (EPA) is redesignating the Southwest Indiana nonattainment area, which consists of a portion of Daviess County and a portion of Pike County (Veale Township in Daviess County and Washington Township in Pike County), to attainment for the 2010 primary, health- based 1-hour sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS). EPA is also approving Indiana's maintenance plan for the Southwest Indiana SO<INF>2</INF> nonattainment area.

Publication Date: 
Tuesday, March 2, 2021 - 4:00am

Air Plan Approval; ID: Logan Utah-Idaho PM2.5

The Environmental Protection Agency (EPA) is proposing to redesignate the Idaho portion of the Logan, Utah-Idaho fine particulate matter (PM<INF>2.5</INF>) nonattainment area (Logan UT-ID NAA) to attainment for the 2006 PM<INF>2.5</INF> National Ambient Air Quality Standard (NAAQS).

Publication Date: 
Wednesday, February 17, 2021 - 4:00am