EPA is taking direct final action to approve revisions to the Knox County portion of the Tennessee State Implementation Plan (SIP), submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC) on August 19, 2009, August 22, 2012, and October 12, 2012. The SIP submittals include changes to Knox County Air Quality Management Regulations concerning open burning, permits and regulation of volatile organic compounds (VOCs). TDEC considers Knox County's SIP revisions to be as or more stringent than the Tennessee SIP requirements. EPA is approving the Knox County SIP revisions because the State has demonstrated that they are consistent with the Clean Air Act (CAA or Act).