The Environmental Protection Agency (EPA) is approving a noninterference demonstration that evaluates whether the change for the Federal Reid Vapor Pressure (RVP) requirements in Shelby County (hereinafter referred to as the "Area") would interfere with the Area's ability to meet the requirements of the Clean Air Act (CAA or Act). Tennessee submitted through the Tennessee Department of Environment and Conservation (TDEC), on April 12, 2017, a noninterference demonstration on behalf of the Shelby County Health Department requesting that EPA change the RVP requirements for Shelby County. Specifically, Tennessee's noninterference demonstration 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 Shelby County would not interfere with attainment or maintenance of the national ambient air quality standards (NAAQS or standards) or with any other CAA requirement.