Approval and Promulgation of Air Quality Implementation Plans; Indiana: Motor Vehicle Inspection and Maintenance

The U.S. Environmental Protection Agency (USEPA) is giving full approval through a direct final action to a state implementation plan (SIP) revision submitted on June 6, 1995 and September 28, 1995, by the Indiana Department of Environmental Management (IDEM). This revision provides for the adoption and implementation of an enhanced motor vehicle emission inspection and maintenance (I/M) program in the areas of Lake, Porter, Clark, and Floyd Counties. The Lake and Porter County area is designated severe nonattainment for ozone and is required to implement an enhanced I/M program. The Clark and Floyd County area is designated moderate nonattainment for ozone and has opted to implement enhanced I/M. These areas are required to attain the National Ambient Air Quality Standards (NAAQS) as specified under the Clean Air Act (Act) by 2007 and 1996, respectively. The implementation of this important program in the areas stated above will reduce vehicle emissions which contribute to the formation of urban smog in Indiana by more than 4.5 tons per day. In the proposed rules section of this Federal Register, USEPA is proposing approval of this I/M program and SIP revision, and solicits public comments on the action. If adverse comments are received on this direct final rule, USEPA will withdraw this final rule and address these comments in a subsequent final rule based on the proposed rule.