The Environmental Protection Agency (EPA) is taking final action to approve portions of a State Implementation Plan (SIP) revision submitted by the Commonwealth of Kentucky, through the Kentucky Division for Air Quality, on December 13, 2016. The changes to the SIP that EPA is taking final action to approve are the attainment status designations, as of October 6, 2016, for geographic areas within the Commonwealth for several national ambient air quality standards (NAAQS). The updates are being made to conform Kentucky's attainment status tables with the federal attainment status designations made for these areas. EPA has determined that the December 13, 2016, SIP revision is consistent with the Clean Air Act (CAA or Act) and EPA's regulations.