The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of South Carolina, through the South Carolina Department of Health and Environmental Control (SC DHEC), on November 4, 2016. This revision was submitted by South Carolina in response to a finding of substantial inadequacy and SIP call published by EPA on June 12, 2015, of provisions in the South Carolina SIP related to excess emissions during startup, shutdown, and malfunction (SSM) events.

The Environmental Protection Agency (EPA or Agency) is finalizing three types of actions the Clean Air Act (CAA or Act) related to 28 areas classified as ``Marginal'' for the 2015 ozone National Ambient Air Quality Standards (NAAQS). First, the Agency is determining that five Marginal areas attained the standards by the August 3, 2021, applicable attainment date. Second, the Agency is granting a 1-year attainment date extension for the Uinta Basin, Utah (UT), nonattainment area.

The Environmental Protection Agency (EPA) is approving a portion of a State Implementation Plan (SIP) revision to the Mecklenburg County portion of the North Carolina SIP, hereinafter referred to as the Mecklenburg County Local Implementation Plan (LIP). The revision was submitted through the North Carolina Division of Air Quality (NCDAQ), on behalf of Mecklenburg County Air Quality (MCAQ), via a letter dated April 24, 2020, which was received by EPA on June 19, 2020.

The Environmental Protection Agency (EPA) is taking final action to withdraw the portion of a March 25, 2019 final action conditionally approving state implementation plan (SIP) submissions from the State of California under the Clean Air Act (CAA or ``Act'') to address contingency measure requirements for the 2008 ozone national ambient air quality standards (NAAQS or ``standards'') in the San Joaquin Valley, California ozone nonattainment area.