Approval and Promulgation of State Implementation Plans; Michigan

The Environmental Protection Agency (EPA) is adjusting the applicability date for reinstating the 1-hour ozone National Ambient Air Quality Standard (NAAQS) in Genesee, Bay, Midland, and Saginaw Counties, Michigan and is determining that these areas have attained the 1-hour ozone NAAQS. This determination is based on 3 consecutive years of complete, quality-assured, ambient air monitoring data for the 1997-1999 ozone seasons that demonstrate that the areas have attained the ozone NAAQS. On the basis of this determination, EPA is also determining that certain attainment demonstration requirements, and certain related requirements of part D of subchapter I of the Clean Air Act (CAA), do not apply to Genesee, Bay, Midland, and Saginaw Counties. EPA is also approving the State of Michigan's request to redesignate Genesee, Bay, Midland, and Saginaw Counties to attainment for the 1-hour ozone NAAQS. Michigan submitted the redesignation request for these areas on May 9, 2000. EPA is also approving the State's plan for maintaining the 1-hour ozone standard for the next 10 years as a revision to the Michigan State Implementation Plan (SIP). In the proposed rules section of this Federal Register, EPA is proposing approval of, and soliciting comments on, this SIP revision. If we receive adverse comments on this action, we will withdraw this final rule and address the comments received in response to this action in a final rule on the related proposed rule. We will not open a second public comment period. Parties interested in commenting on this action should do so at this time.