52.1771—Classification of regions.
The North Carolina plan was evaluated on the basis of the following classifications:
| Air quality control region | Pollutant | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Photochemical oxidants (hydrocarbons) | |
| Western Mountain Intrastate | I | III | III | III | III |
| Eastern Mountain Intrastate | I | III | III | III | III |
| Metropolitan Charlotte Interstate | I | II | III | III | I |
| Northern Piedmont Intrastate | I | III | III | III | III |
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| Eastern Piedmont Intrastate | I | III | III | III | III |
| Northern Coastal Intrastate | I | III | III | III | III |
| Southern Coastal Intrastate | II | III | III | III | III |
| Sandhills Intrastate | II | III | III | III | III |