Regulations last checked for updates: Feb 07, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026
§ 49.9985 - Classification of regions for episode plans.

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 monoxideIII
Nitrogen dioxideIII
OzoneIII
Particulate matter (PM10)II
Sulfur oxidesIII
authority: 42 U.S.C. 7401,
source: 63 FR 7271, Feb. 12, 1998, unless otherwise noted.
cite as: 40 CFR 49.9985