Approval and Promulgation of Implementation Plans; Tennessee: Approval of Revisions to the Knox County Portion of the Tennessee State Implementation Plan

EPA is taking direct final action to approve revisions to the Tennessee State Implementation Plan (SIP) submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), on January 20, 2006. The revisions pertain to the Knox County portion of the Tennessee SIP, and include changes to the Knox County Air Quality Regulations (KCAQR) Section 46.0--"Regulation of Volatile Organic Compounds." The changes were made following EPA action on the corresponding federal law. The changes add four compounds to the list of compounds excluded from the definition of volatile organic compounds (VOC) on the basis that they make a negligible contribution to ozone formation. This action is being taken pursuant to section 110 of the Clean Air Act (CAA).