States are responsible for developing plans and implementing programs to meet and maintain National Ambient Air Quality Standards [NAAQS]. Areas that meet the national ambient air quality standard are considered to be in "attainment". Locations where air pollution levels persistently exceed ambient air quality standards may be designated nonattainment. When NAAQS are tightened to better protect public health, some areas may be designated to nonattainment even though monitoring shows that air quality continues to improve. Michigan DEQ staff continue to strive to provide the best air quality achievable.
Michigan NAAQS Attainment Status Map