11 U.S. Cities With the Worst Air Pollution
Bakersfield and Delano, Calif., residents breathe some of the country’s most polluted air, based on several measures. The area ranks highest in annual and 24-hour peak averages in fine particulates.
Agriculture in this region of the San Joaquin Valley "whips up" a lot of dust, pesticides, and fertilizers, says Dr. Kaufman.
North of Los Angeles, the area also has the second-highest level of ozone pollution in the U.S. Mountains surround the valley on three sides, creating inversion layers that trap pollution, with little wind to carry it away.
Next: Visalia, Calif.
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