40 C.F.R. § 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
Air quality control region	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]