52.1471—Classification of regions.
The Nevada plan is evaluated on the basis of the following classifications:
| Air quality control region | Pollutant | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | |
| Las Vegas Intrastate | I | IA | III | I | I |
| Northwest Nevada Intrastate | I | III | III | III | III |
| Nevada Intrastate | IA | IA | III | III | III |