The Environmental Protection Agency (EPA) is finalizing approval of a State Implementation Plan (SIP) revision submitted by the Commonwealth of Kentucky, through the Kentucky Energy and Environment Cabinet (Cabinet) on December 22, 2021, to address the base year emissions inventory requirements for the 2015 8-hour ozone national ambient air quality standard (NAAQS) for Kentucky counties in the Cincinnati, Ohio-Kentucky 2015 8-hour ozone NAAQS nonattainment area (hereinafter referred to as the Cincinnati, OH-KY Area), and for Kentucky counties in the Louisville, Kentucky-Indiana 2015 8-hour