The Environmental Protection Agency (EPA) is approving a submission by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), on September 29, 2020, to redesignate the Sumner County, Tennessee, unclassifiable area (hereinafter referred to as the "Sumner County Area" or "Area") to attainment/unclassifiable for the 2010 1-hour primary sulfur dioxide (SO<INF>2</INF>) national ambient air quality standard (hereinafter referred to as the 2010 SO<INF>2</INF> 1-hour NAAQS). EPA now has sufficient information to determine that the Sumner County Area is attaining the 2010 1-hour SO<INF>2</INF> NAAQS and is approving the State's request and redesignating the Area to attainment/unclassifiable for the 2010 1-hour SO<INF>2</INF> NAAQS.