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

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EPA is proposing to approve 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 2.5 ), 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 on October 20, 2009, and supplemented it on May 31, 2011. EPA's proposed approval involves several additional related actions. EPA is proposing to make a determination that the Indianapolis area has attained the 1997 annual PM 2.5 standard. EPA is proposing to approve, as a revision to the Indiana State Implementation Plan (SIP), the State's plan for maintaining the 1997 annual PM 2.5 NAAQS through 2025 in the area. EPA is proposing to approve the 2006 emissions inventory for the Indianapolis area as meeting the comprehensive emissions inventory requirement of the CAA. Finally, EPA finds adequate and is proposing to approve Indiana's Nitrogen Oxides (NO X ) and PM 2.5 Motor Vehicle Emission Budgets (MVEBs) for