According to a report in 2009, Los Angeles is the most polluted city in America, followed by Bakersfield, Visalia, and Fresno.
Because of its heavy reliance on automobiles and the Los Angeles/Long Beach port complex, Los Angeles suffers from a great problem of smog. The Los Angeles Basin and the San Fernando Valley are susceptible to atmospheric inversion, which holds in the exhausts from road vehicles, airplanes, locomotives, shipping, manufacturing, and other sources.
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