40 Protection of Environment 3 2003-07-01 2003-07-01 false Classification of regions. 52.321 Section 52.321 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS-(CONTINUED) APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS Colorado
ยง 52.321 Classification of regions.

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

Air quality control region Pollutant Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone Pawnee Intrastate I III III III III Metropolitan Denver Intrastate I III III I I Comanche Intrastate III III III III III San Isabel Intrastate I III III III III San Luis Intrastate III III III III III Four Corners Interstate IA IA III III III Grand Mesa Intrastate III III III III III Yampa Intrastate III III III III III [37 FR 10855, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 44 FR 57409, Oct. 5, 1979]