40 CFR § 52.1221
Classification of regions
June 9, 2020
The Minnesota 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 | Photochemical oxidants (hydrocarbons) | |
| Central Minnesota Intrastate | II | III | III | III | III |
| Southeast Minnesota-La Crosse (Wisconsin) Interstate | II | Ia | III | III | III |
| Duluth (Minnesota)-Superior (Wisconsin) Interstate | I | II | III | III | III |
| Metropolitan Fargo-Moorhead Interstate | II | III | III | III | III |
| Minneapolis-St. Paul Intrastate | I | I | III | I | III |
| Northwest Minnesota Intrastate | II | III | III | III | III |
| Southwest Minnesota Intrastate | III | III | III | III | III |
[37 FR 10874, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]
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