San Diego–Chula Vista-Carlsbad, 6. Medford-Grants Pass, Oregon, 6. Chico. 7. Denver-Aurora, Colorado, 7. Fairbanks, Arkansas, 7.
Where Los Angeles ranks among California's most polluted cities – KTLA
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San Diego–Chula Vista-Carlsbad, 6. Medford-Grants Pass, Oregon, 6. Chico. 7. Denver-Aurora, Colorado, 7. Fairbanks, Arkansas, 7.
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