The Environmental Protection Agency (EPA) is finalizing approval 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 Air Quality (NCDAQ), on behalf of Mecklenburg County Air Quality (MCAQ), via a letter dated April 24, 2020, and was received by EPA on June 19, 2020. The revision updates several Mecklenburg County Air Pollution Control Ordinance (MCAPCO) rules incorporated into the LIP, including updating and revising certain definitions. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).