The Environmental Protection Agency (EPA) is approving the State of Tennessee's November 21, 2016, revision to its State Implementation Plan (SIP), submitted through the Tennessee Department of Environment and Conservation (TDEC), in support of the State's request that EPA change the federal Reid Vapor Pressure (RVP) requirements for Davidson, Rutherford, Sumner, Williamson, and Wilson Counties (hereinafter referred to as the "Middle Tennessee Area" or "Area"). Tennessee's November 21, 2016, SIP submittal revises its maintenance plan for the Middle Tennessee Area for the 1997 8-hour ozone national ambient air quality standard (NAAQS) and demonstrates that relaxing the federal RVP requirements in this Area would not interfere with the Area's ability to meet the requirements of the Clean Air Act (CAA or Act). Specifically, Tennessee's SIP revision concludes that relaxing the federal RVP requirement from 7.8 pounds per square inch (psi) to 9.0 psi for gasoline sold between June 1 and September 15 of each year in the Area would not interfere with attainment or maintenance of the NAAQS or with any other CAA requirement. EPA has determined that Tennessee's November 21, 2016, SIP revision is consistent with the applicable provisions of the CAA.