View all text of Subpart X [§ 52.1170 - § 52.1190]
§ 52.1171 - Classification of regions.
The Michigan plan was evaluated on the basis of the following classifications:
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 |
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