Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Ohio and Indiana; Redesignation of the Ohio and Indiana Portions of the Cincinnati-Hamilton 1997 Annual Fine Particulate Matter Nonattainment Area to Attainment

Riepilogo

EPA is approving, under the Clean Air Act (CAA), Ohio's and Indiana's requests to redesignate their respective portions of the Cincinnati-Hamilton nonattainment area (for Ohio: Butler, Clermont, Hamilton, and Warren Counties, Ohio; for Indiana: a portion of Dearborn County) to attainment for the 1997 annual National Ambient Air Quality Standard (NAAQS or standard) for fine particulate matter (PM 2.5 ). The Ohio Environmental Protection Agency (Ohio EPA) submitted its request on December 9, 2010, and the Indiana Department of Environmental Management (IDEM) submitted its request on January 25, 2011. EPA's approvals here involve several additional related actions. EPA has determined that the entire Cincinnati-Hamilton area has attained the 1997 annual PM 2.5 standard. EPA is approving, as revisions to the Ohio and Indiana State Implementation Plans (SIPs), the states' plans for maintaining the 1997 annual PM 2.5 NAAQS through 2021 in the area. EPA is approving the 2005 emissions inventories for the Ohio and Indiana portions of the Cincinnati-Hamilton area as meeting the comprehensive emissions inventory requirement of the CAA. Finally, EPA finds adequate and is approving Ohio and Ind