The United States Environmental Protection Agency (USEPA) requires Michigan to attain the National Ambient Air Quality Standards (NAAQS) for six criteria pollutants. The data contained in this layer file outlines the statewide nonattainment areas and maintenance areas for the 2015 Ozone NAAQS as designated by the USEPA. The nonattainment areas consist of two partial counties (Allegan and Muskegon) and one full county (Berrien) located on the west side along Lake Michigan. In southeast Michigan there is a seven-county Attainment/Maintenance area. Further information about the six criteria pollutant NAAQS and Michigan’s ozone designation status can be found on EGLE Air Quality Division’s SIP and Attainment webpage. Field NameAliasDescriptionAreaNameAreaNameNonattainment Area designation name. This is how the area is typically referred to within regulatory documents.Shape_AreaShape.STArea()N/AShape_LengthShape.STLength()N/AEpaWebsiteEPA WebsiteLink provided to the USEPA Green Book which provides historic and geographic designation information for the 2015 Ozone standard.AdditionalInformationAdditional InformationLink provided to the general EGLE AQD Attainment and SIP webpage which features additional information on the Ozone NAAQS in Michigan and the related regulatory submittals.EgleAqdWebsiteEGLE WebsiteLink provided to the general EGLE Air Quality Division webpage.FederalRegisterNoticeFederalRegisterNoticeLink provided for each entry to the initial Federal Register notice designating the area as nonattainment.AreaDesignationArea DesignationDenotes the area’s current designation and classification status. For the ozone standard areas can be designated and reclassified as marginal, moderate, serious, severe, or extreme nonattainment areas. Additionally, areas which were initially designated as nonattainment and have since come back into attainment are classified as Attainment/Maintenance. Questions about this data can be directed to Marissa Vaerten at VaertenM@michigan.gov.