Determination of Attainment, Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Indiana; Redesignation of Central Indiana To Attainment of the 8-Hour Ozone Standard

On March 26, 2007, the Indiana Department of Environmental Management (IDEM) submitted a request for EPA approval of a redesignation of Boone, Hamilton, Hancock, Hendricks, Johnson, Madison, Marion, Morgan, and Shelby Counties (the Central Indiana Area) to attainment of the 8-hour ozone National Ambient Air Quality Standard (NAAQS). IDEM also requested EPA approval of an ozone maintenance plan for this area as a revision of the Indiana State Implementation Plan (SIP). The maintenance plan demonstrates maintenance of the ozone NAAQS in this area through 2020 and establishes 2006 and 2020 motor vehicle Volatile Organic Compounds (VOC) and Nitrogen Oxides (NO<INF>X</INF>) emission budgets for this area. EPA is making a determination that the Central Indiana Area has attained the 8-hour ozone NAAQS. EPA is approving, as a SIP revision, the State's ozone maintenance plan for this area. Indiana has satisfied the criteria for the redesignation of the Central Indiana Area to attainment of the 8-hour ozone NAAQS, and, therefore, EPA is approving Indiana's ozone redesignation request for this area. Further, EPA is approving, for purposes of transportation conformity, the VOC and NO<INF>X</INF> Motor Vehicle Emission Budgets (MVEBs) for 2006 and 2020 that are contained in the 8-hour ozone maintenance plan. EPA proposed these actions on July 31, 2007, and received only one comment in response supporting the proposed actions.