[Code of Federal Regulations] [Title 40, Volume 3] [Revised as of July 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR52.121] [Page 133] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 52_APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS --Table of Contents Subpart D_Arizona Sec. 52.121 Classification of regions. The Arizona plan is evaluated on the basis of the following classifications: ---------------------------------------------------------------------------------------------------------------- Classifications AQCR (constituent counties) ------------------------------------------------- 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, I III III III III Yavapai)..................................................... 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 I IA III III III Cruz)........................................................ ---------------------------------------------------------------------------------------------------------------- [45 FR 67345, Oct. 10, 1980]