The Environmental Protection Agency (EPA or Agency) is finalizing the approval of changes to the North Carolina State Implementation Plan (SIP), submitted by the State of North Carolina through the North Carolina Division of Air Quality (NCDAQ), through a letter dated October 9, 2020. The SIP revisions include changes to NCDAQ's regulations regarding monitoring and performance testing for stationary sources of air pollution. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).

On December 29, 2021, the Environmental Protection Agency (EPA or ``Agency'') published a proposed rule to approve the State of California's Serious area plan for the San Joaquin Valley (SJV) for the 2012 annual fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS) for all Serious PM<INF>2.5</INF> area planning requirements, except for contingency measures, which the EPA proposed to disapprove.

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the Commonwealth of Pennsylvania. The revision will fulfill Pennsylvania's nonattainment new source review (NNSR) SIP element requirement for the 2015 8-hour ozone national ambient air quality standard (NAAQS). EPA is approving these revisions to the Pennsylvania SIP in accordance with the requirements of the Clean Air Act (CAA).

The Environmental Protection Agency (EPA) is finalizing the approval of a revision to the Kentucky State Implementation Plan (SIP), submitted by the Commonwealth of Kentucky, through the Kentucky Division for Air Quality (KDAQ), on March 29, 2021. The revision was submitted by KDAQ on behalf of the Louisville Metro Air Pollution Control District (District or Jefferson County), which has jurisdiction over Jefferson County, Kentucky.