The Environmental Protection Agency (EPA) is approving a revision to the Chattanooga portion of the Tennessee State Implementation Plan (SIP) submitted by the State of Tennessee through the Tennessee Department of Environment and Conservation (TDEC) on behalf of the Chattanooga/Hamilton County Air Pollution Control Bureau (Bureau) on September 12, 2018. The SIP submittal removes and replaces the Chattanooga City Code, Air Pollution Control Ordinances pertaining to the Chattanooga-Hamilton County Air Pollution Control Board (Board), powers and duties of the Board, penalties, enforcement and permit fees. The SIP revision that EPA is approving is consistent with the requirements of the Clean Air Act (CAA or Act).