52.121—Classification of regions.

The Arizona plan is evaluated on the basis of the following classifications:
AQCR (constituent counties) Classifications
PM SOX NO2 CO O3
Maricopa Intrastate (Maricopa) I III III I I
Pima Intrastate (Pima) I II III III I
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 III
Southeast Arizona Intrastate (Cochise, Graham, Greenlee, Santa Cruz) I IA III III III

Code of Federal Regulations

[45 FR 67345, Oct. 10, 1980]