Air Plan Approval; Indiana; Redesignation of the Indiana Portion of the Cincinnati-Hamilton, OH-IN-KY Area to Attainment of the 1997 Annual Standard for Fine Particulate Matter

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The Environmental Protection Agency (EPA) is redesignating the Indiana portion of the Cincinnati-Hamilton, OH-IN-KY, nonattainment area (hereafter, "the Cincinnati-Hamilton area") to attainment for the 1997 fine particulate matter (PM 2.5 ) annual national ambient air quality standard (NAAQS or standard). The Indiana portion of the Cincinnati-Hamilton area includes Lawrenceburg Township within Dearborn County. Because EPA has determined that the Cincinnati- Hamilton area is attaining this annual PM 2.5 standard, EPA is redesignating the area to attainment and also approving several additional related actions. First, EPA is approving an update to the Indiana State implementation plan (SIP) by updating the state's approved plan for maintaining the 1997 annual PM 2.5 NAAQS through 2027. In addition, EPA previously approved the base year emissions inventory for the Cincinnati-Hamilton area, and is approving Indiana's updated emissions inventory which includes emissions inventories for volatile organic compounds (VOCs) and ammonia. Indiana's approved maintenance plan submission also includes a budget for the mobile source contribution of PM 2.5 and nitrogen oxides (NO X ) to the Cincinn