§ 52.121 Classification of regions.
Current through Aug 22, 2025 · Read all of Part 52
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 | III | III | III | III |
| Northern Arizona Intrastate (Apache, Coconino, Navajo, Yavapai) | I | III | III | III | III |
| Mohave-Yuma Intrastate (La Paz, 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; 90 FR 59056, Dec. 18, 2025]