Approval and Promulgation of Implementation Plan; Michigan

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The United States Environmental Protection Agency is granting an exemption to the Detroit-Ann Arbor ozone nonattainment area from applicable oxides of nitrogen (NO X) requirements found in the Clean Air Act (Act). Approval of the exemption would apply for various NO X including adoption and implementation of regulations addressing general conformity, transportation conformity, inspection and maintenance, reasonably available control technology, and new source review. A NO X exemption request was submitted by the State of Michigan on November 12, 1993. A subsequent letter dated May 31, 1994 clarified this earlier submittal. This request is based on the fact that the Detroit-Ann Arbor area has not monitored a violation of the ozone standard for a 3-year period; 1991 to 1993. Given this monitoring data, Michigan may petition for an exemption from the NO X requirements based on a demonstration that additional reductions of NO X would not contribute to attainment of the ozone standard. The rationale for this approval is set forth in this final rule; additional information is available at the address indicated below. Elsewhere in this Federal Register, EPA is proposing approval of, and s