As reported in Trinity's Regulatory Update eNews, USEPA finalized area designations for the 2008 8-hour ozone National Ambient Air Quality Standard (NAAQS) on April 30th for everywhere but twelve counties in Illinois, Indiana, and Wisconsin (the "Chicago metropolitan area", which includes portions of southeast Wisconsin).
On May 31st, non-attainment designations for the Chicago metropolitan area were finalized. In Wisconsin, part of Kenosha County (Pleasant Prairie and Somers Townships) was included in the Chicago metropolitan non-attainment area. Follow this link to a map of the Region V states 2008 8-hour ozone non-attainment areas map.
All of Kenosha County, plus Milwaukee, Ozaukee, Racine, Sheboygan, Washington, and Waukesha Counties (the "Milwaukee-Racine and Sheboygan" areas) are designated as moderate non-attainment under the 1997 standards. The Milwaukee-Racine and Sheboygan areas are in the process of obtaining status as attainment under the 1997 standard. On February 9, 2012, USEPA proposed approval for the redesignation of the Milwaukee-Racine and Sheboygan areas to attainment with the 1997 ozone standard. Once re-designation under the 1997 standard is complete, only sources in Kenosha's Pleasant Prairie and Somers Townships within the Milwaukee-Racine area, as well as Sheboygan County, will be required to comply with non-attainment rules.