According to the California Air Resources Board, of the five largest urban areas in the state only the San Francisco Bay Area meets all federal standards for ozone and fine particulate matter.
Of the state's five biggest urban areas, only the San Francisco Bay Area meets all federal standards for ozone — the worst component of smog — and fine particulate matter, or soot.
Smog levels remains above federal health standards in parts of Greater Los Angeles, the San Joaquin Valley, Sacramento and San Diego.
Health studies link fine-particle pollution and ozone to respiratory illness, asthma, heart disease and cancer.
Source: Los Angeles Times
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