Approval and Promulgation of Air Quality Implementation Plans; Indiana; Redesignation of the Indianapolis Area to Attainment of the 1997 Annual Standard for Fine Particulate Matter

EPA is approving Indiana's request to redesignate the Indianapolis, Indiana nonattainment area (Hamilton, Hendricks, Johnson, Marion, and Morgan Counties) to attainment for the 1997 annual National Ambient Air Quality Standard (NAAQS or standard) for fine particulate matter (PM<INF>2.5</INF>) because the request meets the statutory requirements for redesignation under the Clean Air Act (CAA). The Indiana Department of Environmental Management (IDEM) submitted this request to EPA on October 20, 2009, and supplemented it on May 31, 2011, January 17, 2013, and March 18, 2013. EPA's approval involves several related actions. EPA is making a determination that the Indianapolis area has attained the 1997 annual PM<INF>2.5</INF> standard. EPA is approving, as a revision to the Indiana State Implementation Plan (SIP), the state's plan for maintaining the 1997 annual PM<INF>2.5</INF> NAAQS through 2025 in the area. EPA is approving the comprehensive emissions inventories submitted by IDEM for Nitrogen Oxides (NO<INF>X</INF>), Sulfur Dioxide (SO<INF>2</INF>), primary PM<INF>2.5</INF>, Volatile Organic Compounds (VOC), and ammonia as meeting the requirements of the CAA. Finally, EPA finds adequate and is approving Indiana's NO<INF>X</INF> and PM<INF>2.5</INF> Motor Vehicle Emission Budgets (MVEBs) for 2015 and 2025 for the Indianapolis area.