The Environmental Protection Agency (EPA) is taking final action to approve portions of State Implementation Plan (SIP) revisions submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), on May 12, 2017. The portions that EPA is approving are the emissions inventory and nonattainment new source review (NNSR) requirements for the 2010 1-hour sulfur dioxide (SO<INF>2</INF>) primary national ambient air quality standard (NAAQS) for the Sullivan County SO<INF>2</INF> nonattainment area (hereinafter referred to as the "Sullivan County Area" or "Area"). The Sullivan County Area is comprised of a portion of Sullivan County in Tennessee surrounding the Eastman Chemical Company (hereinafter referred to as "Eastman"). EPA is not taking action on the other portions of the May 12, 2017, SIP submissions. EPA has determined that Tennessee has met the applicable emissions inventory and NNSR requirements under the Clean Air Act (CAA or Act) for the 2010 1-hour primary SO<INF>2</INF> NAAQS in the Sullivan County Area.