40 CFR 52.221: Classification of regions.

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

Table 1 to § 52.221

Air quality control region Pollutant

Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)

Great Basin Valley Intrastate I III III III III

Lake County Intrastate II III III III I

Lake Tahoe Intrastate II III III I III

Metropolitan Los Angeles Intrastate I III III I I

Mountain Counties Intrastate II III III I I

North Central Coast Intrastate II III III III I

North Coast Intrastate II III III III III

Northeast Plateau Intrastate III III III III III

Sacramento Valley Intrastate II III III I I

San Diego Intrastate II III III I I

San Francisco Bay Area Intrastate II III III I I

San Joaquin Valley Intrastate II III III I I

South Central Coast Intrastate III III III III I

Southeast Desert Intrastate I III III III I