CFR
- Title 1 - General Provisions
- Title 2 - Grants and Agreements
- Title 3 - The President
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- Title 50 - Wildlife and Fisheries
52.2171—Classification of regions.
The South Dakota plan evaluated on the basis of the following classifications:
| Air quality control region | Pollutant | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Photochemical oxidants (hydrocarbons) | |
| Metropolitan Sioux City Interstate | III | III | III | III | III |
| Metropolitan Sioux Falls Interstate | II | III | III | III | III |
| Black Hills—Rapid City Intrastate | III | III | III | III | III |
| South Dakota Intrastate | III | III | III | III | III |
Code of Federal Regulations
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