Approval and Promulgation of State Implementation Plans; Michigan

The United States Environmental Protection Agency (EPA) is adjusting the applicability date for reinstating the 1-hour ozone National Ambient Air Quality Standard (NAAQS) in Muskegon County, Michigan and is determining that the area has 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 area has 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 the Muskegon area. EPA is also approving the State of Michigan's request to redesignate Muskegon County to attainment for the 1-hour ozone NAAQS. Michigan submitted the redesignation request for the Muskegon area on March 9, 1995, and submitted two updates to the request on June 14 and July 5, 2000. In approving this redesignation request, 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 this direct final rule, EPA is also notifying the public that we believe the motor vehicle emissions budgets for volatile organic compounds (VOC) and oxides of nitrogen (NO<INF>X</INF>) in the Muskegon, MI submitted maintenance plan are adequate for conformity purposes and approvable as part of the maintenance plan. 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 based 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.