Approval and Promulgation of State Implementation Plans; Michigan

摘要

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 Allegan 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 the 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 Allegan area. EPA is also approving the State of Michigan's request to redesignate Allegan County to attainment for the 1-hour ozone NAAQS. Michigan submitted the redesignation request for the Allegan area in two submittals dated September 1, 2000 and October 13, 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