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

[86 FR 16537, Mar. 30, 2021]