40 CFR § 81.221
Southwest Oregon Intrastate Air Quality Control Region
June 9, 2020
The Southwest Oregon Intrastate Air Quality Control Region consists of the territorial area encompassed by the boundaries of the following jurisdictions or described area (including the territorial area of all municipalities (as defined in section 302(f) of the Clean Air Act, 42 U.S.C. 1857h(f)) geographically located within the outermost boundaries of the area so delimited):
In the State of Oregon: Coos County, Curry County, Douglas County, Jackson County, Josephine County.