40 CFR 52.121 - Classification of regions.

Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024

§ 52.121 - Classification of regions.

The Arizona plan is evaluated on the basis of the following classifications:

AQCR (constituent counties)	Classifications
AQCR (constituent counties)	PM	SOX	NO2	CO	O3
Maricopa Intrastate (Maricopa)	I	III	III	I	I
Pima Intrastate (Pima)	I	III	III	III	III
Northern Arizona Intrastate (Apache, Coconino, Navajo, Yavapai)	I	III	III	III	III
Mohave-Yuma Intrastate (Mohave, Yuma)	I	III	III	III	III
Central Arizona Intrastate (Gila, Pinal)	I	IA	III	III	I
Southeast Arizona Intrastate (Cochise, Graham, Greenlee, Santa Cruz)	I	IA	III	III	III

[83 FR 42219, Aug. 21, 2018, as amended at 89 FR 71835, Sept. 4, 2024]

authority: 42 U.S.C. 7401

cite as: 40 CFR 52.121