Air Plan Approval and Air Quality Designation; KY; Redesignation of the Kentucky Portion of the Louisville Unclassifiable Area

On May 4, 2018, the Commonwealth of Kentucky, through the Kentucky Energy and Environment Cabinet, Division for Air Quality (KDAQ), submitted a request for the Environmental Protection Agency (EPA) to redesignate the portion of Kentucky that is within the bi- state Louisville, KY-IN fine particulate matter (PM2.5) unclassifiable area (hereinafter referred to as the ``bi-state Louisville Area'' or ``Area'') to unclassifiable/attainment for the 2012 primary annual PM2.5 national ambient air quality standard (NAAQS). The bi-state Louisville Area consists of Jefferson County and a portion of Bullitt County in Kentucky, as well as Clark and Floyd Counties in Indiana. EPA is approving the State's request and redesignating the Area to unclassifiable/attainment for the 2012 primary annual PM2.5 NAAQS based upon valid, quality- assured, and certified ambient air monitoring data showing that the PM2.5 monitors in the bi-state Louisville Area are in compliance with the 2012 primary annual PM2.5 NAAQS.