Air Plan Approval; Indiana; Redesignation of the Indiana Portion of the Cincinnati, Ohio-Kentucky-Indiana Area to Attainment of the 2008 Ozone Standard

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The Environmental Protection Agency (EPA) is proposing to find that the Cincinnati, Ohio-Kentucky-Indiana area is attaining the 2008 ozone National Ambient Air Quality Standard (NAAQS or standard) and to approve a request from the Indiana Department of Environmental Management (IDEM) to redesignate the Indiana portion of the Cincinnati area to attainment for the 2008 ozone NAAQS because the request meets the statutory requirements for redesignation under the Clean Air Act (CAA or Act). The Cincinnati area includes Lawrenceburg Township in Dearborn County, Indiana; Butler, Clermont, Clinton, Hamilton, and Warren Counties in Ohio; and, Boone, Campbell, and Kenton Counties in Kentucky. IDEM submitted this request on February 23, 2016, and supplemented that submittal with a revised emissions inventory on May 4, 2016. EPA is also proposing to approve, as a revision to the Indiana State Implementation Plan (SIP), the state's plan for maintaining the 2008 ozone standard through 2030 in the Cincinnati area. Additionally, EPA finds adequate and is proposing to approve the state's 2020 and 2030 volatile organic compound (VOC) and oxides of nitrogen (NO X ) Motor Vehicle Emission Budgets (MVE