The Environmental Protection Agency (EPA) is proposing to approve 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 Pollution Control (MCAQ), via a letter dated April 24, 2020, which was received by EPA on June 19, 2020.

The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Florida, through the Florida Department of Environmental Protection (FDEP), via a letter dated July 2, 2020. The revision removes rules prohibiting tampering with motor vehicle air pollution control equipment and rules concerning visible emissions from motor vehicles. EPA is proposing to remove the tampering rules and visible emissions rules from the SIP pursuant to the Clean Air Act (CAA or Act) and applicable regulations.

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the San Joaquin Valley Air Pollution Control District (SJVAPCD or ``the District'') portion of the California State Implementation Plan (SIP). This revision concerns the District's New Source Review permitting program for new and modified sources of air pollution under section 110(a)(2)(C) of the Clean Air Act (CAA); specifically our approval of Rule 2021: Experimental Research Operations.

The Environmental Protection Agency (EPA) is proposing to approve revisions to the Alaska State Implementation Plan (SIP) submitted on November 10, 2020. The revisions update the adoption by reference of certain Federal air regulations and add a pre-approved emission limit option that may be used to permit diesel engine facilities, among other changes. The EPA is proposing to approve the submitted revisions as consistent with Clean Air Act requirements.