40 C.F.R. § 52.1971

Current through May 31, 2024

Section 52.1971 - Classification of regions

The Oregon plan was evaluated on the basis of the following classifications:

Air quality control region	Pollutant
	Particulate matter	Sulfur oxides	Nitrogen dioxide	Carbon monoxide	Ozone
Portland Interstate	I	IA	III	I	I
Southwest Oregon Intrastate	II	III	III	III	III
Northwest Oregon Intrastate	III	III	III	III	III
Central Oregon Intrastate	II	III	III	III	III
Eastern Oregon Intrastate	II	III	III	III	III

40 C.F.R. §52.1971

37 FR 10888, May 31, 1972, as amended at 45 FR 42278, June 24, 1980