CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS > SUBPART G—Colorado (§52.320 to §52.352) > 52.321—Classification of regions.

52.321—Classification of regions.

The revised Denver Emergency Episode Plan, adopted by the State of Colorado February 28, 1996, was submitted by the Governor of Colorado with a September 16, 1997 letter.
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

Code of Federal Regulations

[37 FR 10855, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 44 FR 57409, Oct. 5, 1979; 74 FR 47891, Sept. 18, 2009]