40 CFR § 52.1171
Classification of regions
June 9, 2020
The Michigan plan was evaluated on the basis of the following classifications:
Open Table
| Air quality control region | Pollutant | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | |
| Metropolitan Detroit-Port Huron Intrastate | I | I | III | III | III |
| Metropolitan Toledo Interstate | I | I | III | III | I |
| South Central Michigan Intrastate | II | II | III | III | III |
| South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) Interstate | I | IA | III | III | III |
| Central Michigan Intrastate | II | III | III | III | III |
| Upper Michigan Intrastate | III | III | III | III | III |
[37 FR 10873, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 29801, May 6, 1980]
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