40 C.F.R. § 49.10525
Classification of regions for episode plans
The air quality control region which encompasses the lands in trust that are within the Puyallup Reservation is classified as follows for purposes of episode plans:
| Pollutant | Classification |
|---|---|
| Carbon monoxide | I |
| Nitrogen dioxide | III |
| Ozone | I |
| Particulate matter (PM10) | I |
| Sulfur oxides | IA |