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 [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]