Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Indiana; Redesignation of Lake and Porter Counties to Attainment for Ozone
EPA is taking several related actions affecting Lake and Porter Counties and the State of Indiana for the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS or standard). EPA is approving a request from the State of Indiana to redesignate Lake and Porter Counties, the Indiana portion of the Chicago-Gary-Lake County, Illinois-Indiana (IL-IN) 8-hour ozone nonattainment area, to attainment of the 1997 8-hour ozone NAAQS. In addition, EPA is approving, as a revision to the Indiana State Implementation Plan (SIP), the State's plan for maintaining the 1997 8-hour ozone NAAQS through 2020 in Lake and Porter Counties and in the Chicago-Gary-Lake County, IL-IN ozone nonattainment area. EPA is also approving the 2002 Volatile Organic Compounds (VOC) and Nitrogen Oxides (NOX) emission inventories for Lake and Porter Counties as a SIP revision and as meeting the requirements of the Clean Air Act (CAA). Finally, EPA finds adequate and is approving the State's 2010 and 2020 VOC and NOX Motor Vehicle Emission Budgets (MVEBs) for Lake and Porter Counties.