The air quality control region which encompasses the Reservation of the Confederated Tribes of the Grand Ronde Community 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 |