U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
The Louisiana plan was evaluated on the basis of the following classifications:
| Air quality control region | Pollutant | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | |
| Southern Louisiana-Southeast Texas Interstate | II | I | III | III | I |
| Shreveport-Texarkana-Tyler Interstate | II | III | III | III | III |
| Monroe-El Dorado Interstate | II | III | III | III | III |
