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 for the 2015 Ozone NAAQS as designated by the USEPA. There are two partial and one full nonattainment counties located on the west side along Lake Michigan (i.e., Allegan, Berrien - full, and Muskegon), along with a seven-county area located in southeast Michigan. Further information about the six criteria pollutant NAAQS, including ozone can be found on EGLE Air Quality Division's SIP and Attainment webpage.Questions about this data can be directed toEGLE-Maps@Michigan.gov.
Michigan Dept. of Environment, Great Lakes, and Energy