Approval and Promulgation of Implementation Plan; Wisconsin

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United States Environmental Protection Agency (USEPA) approves Wisconsin's 1990 base year ozone (O 3) emission inventory as a revision to the Wisconsin State Implementation Plan (SIP) for O 3. The inventory was submitted by the State of Wisconin to satisfy a Federal requirement that those States containing O 3 nonattainment areas (NAAs) classified as marginal to extreme submit inventories of actual O 3 season and emissions from all sources in accordance with USEPA guidance. Wisconsin's O 3 NAAs are the counties of Walworth, Door, Kewaunee, Manitowoc, Sheboygan, and the six county Milwaukee area (counties Washington, Ozaukee, Waukesha, Milwaukee, Racine, and Kenosha). The rationale for the approval is set forth in this final rule; additional information is available at the address indicated below in the supporting Technical Support Document (TSD).