The Environmental Protection Agency (EPA) is finalizing a determination that the Allegheny County, Pennsylvania nonattainment area has clean data for the 2012 annual fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standard (NAAQS). This clean data determination (CDD) is based upon quality-assured, quality- controlled, and certified ambient air monitoring data showing the area has attained the 2012 annual PM<INF>2.5</INF> NAAQS based on the 2018- 2020 data available in EPA's Air Quality System (AQS) database.

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of Connecticut. This revision approves into the Connecticut SIP state regulations that apply restrictions on emissions of criteria pollutants for which EPA has established National Ambient Air Quality Standards. Separately, we are also approving Connecticut regulations that apply restrictions on emissions of hazardous air pollutants (HAPs).

The Environmental Protection Agency (EPA) is finalizing a State Implementation Plan (SIP) revision to the Mecklenburg County portion of the North Carolina SIP, hereinafter referred to as the Mecklenburg Local Implementation Plan (LIP). The revision was submitted by the State of North Carolina, through the North Carolina Division of Air Quality (NCDAQ), on behalf of Mecklenburg County Air Quality via a letter dated April 24, 2020. The revision seeks to remove transportation facilities rules from the Mecklenburg County Air Pollution Control Ordinance (MCAPCO) rules incorporated into the LIP.

The Environmental Protection Agency (EPA) is proposing to fully approve 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 redesignate the NAA to attainment for the 24-hour PM<INF>10</INF> National Ambient Air Quality Standard (NAAQS).