The Environmental Protection Agency (EPA) is approving several Tennessee State Implementation Plan (SIP) revisions submitted by the Tennessee Department of Environment and Conservation (TDEC), on behalf of Knox County's Air Quality Management Division by a letter dated May 24, 2018. The submissions revise four sections of Knox County's Air Quality Management Regulations covering definitions, opening burning, permits and emissions reporting requirements. These actions are being approved pursuant to the Clean Air Act (CAA or Act).