The air quality control region which encompasses the Reservation of the Confederated Tribes of the Coos, Lower Umpqua and Siuslaw Indians is classified as follows for purposes of episode plans:
| Pollutant
| Classification
|
|---|
| Carbon monoxide | III
|
| Nitrogen dioxide | III
|
| Ozone | III
|
| Particulate matter (PM10) | II
|
| Sulfur oxides | III |