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 F—California (§52.219 to §52.282) > 52.221—Classification of regions.

52.221—Classification of regions.

The California plan was evaluated on the basis of the following classifications:
Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)
North Coast Intrastate II III III III III
San Francisco Bay Area Intrastate II II III I I
North Central Coast Intrastate II III III III I
South Central Coast Intrastate III III III III III
Metropolitan Los Angeles Intrastate I II I I I
Northeast Plateau Intrastate III III III III III
Sacramento Valley Intrastate II III III I I
San Joaquin Valley Intrastate I III III I I
Great Basin Valley Intrastate III III III III III
Southeast Desert Intrastate I III III III I
San Diego Intrastate II III III I I
Lake County Intrastate II III III III III
Lake Tahoe Intrastate II III III I I
Mountain Counties Intrastate II III III I I

Code of Federal Regulations

[37 FR 10850, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 46 FR 3884, Jan. 16, 1981]