The Environmental Protection Agency (EPA) is approving a revision to the Chattanooga portion of the Tennessee State Implementation Plan (SIP), provided by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC) from the Chattanooga/Hamilton County Air Pollution Control Bureau through a letter dated September 12, 2018. The submission revises the open burning regulations in the Chattanooga portion of the Tennessee SIP. EPA is approving the changes because they are consistent with the Clean Air Act (CAA or Act).