The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of Tennessee through the Department of Environment and Conservation (TDEC), Division of Air Pollution Control, via a letter dated September 28, 2022. Specifically, EPA is finalizing the approval of a SIP revision which modifies the State's required monitoring standards by adding exemptions to opacity monitoring requirements. EPA is approving this revision pursuant to the Clean Air Act (CAA or Act).