The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), on January 11, 2016. The revision was submitted by TDEC on behalf of the Knox County Department of Air Quality Management, which has jurisdiction over Knox County, Tennessee. The revision that EPA is approving amends the Knox County Air Quality Management Department's regulations, which are part of the Tennessee SIP, to address EPA's startup, shutdown, and malfunction (SSM) SIP call for Knox County. EPA is approving the January 11, 2016, SIP revision because the Agency has determined that it is in accordance with the requirements for SIP provisions under the Clean Air Act (CAA or Act).