EPA is taking direct final action to approve changes to the Tennessee State Implementation Plan (SIP), submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC) on September 3, 1999. Tennessee's September 3, 1999, SIP adds 17 compounds to the list of compounds excluded from the definition of "Volatile Organic Compound" (VOC). EPA is approving this SIP revision because the State has demonstrated that it is consistent with the Clean Air Act (CAA or Act).