Determination of Attainment, Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Indiana; Redesignation of the Clark and Floyd Counties 8-Hour Ozone Nonattainment Area to Attainment

On November 15, 2006, the Indiana Department of Environmental Management (IDEM) submitted a request to EPA for approval of the redesignation of the Indiana portion of the Louisville 8-hour ozone National Ambient Air Quality Standard (NAAQS) nonattainment area (Clark and Floyd Counties) to attainment of the 8-hour ozone NAAQS and of an ozone maintenance plan for Clark and Floyd Counties as revisions to the Indiana State Implementation Plan (SIP). On May 8, 2007, EPA proposed to approve this submission and no adverse comments have been received. Today, EPA is approving Indiana's request and corresponding SIP revision. In so doing, EPA is making a determination that the Indiana portion of the Louisville 8-hour ozone NAAQS has attained the 8-hour ozone NAAQS. This determination is based on three years of complete, quality-assured ambient air quality monitoring data for the 2003-2005 ozone seasons that demonstrate that the 8-hour ozone NAAQS has been attained in the area. In addition, quality-assured monitoring data for 2006 show that the area continues to attain the standard. Finally, EPA is approving, for purposes of transportation conformity, the motor vehicle emission budgets (MVEBs) for the years 2003 and 2020.