San Diego–Chula Vista-Carlsbad. 6. Medford-Grants Pass, Oregon. 6. Chico. 7. Denver-Aurora, Colorado. 7. Fairbanks, Arkansas.
These are the most polluted cities in California: report – Yahoo News
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San Diego–Chula Vista-Carlsbad. 6. Medford-Grants Pass, Oregon. 6. Chico. 7. Denver-Aurora, Colorado. 7. Fairbanks, Arkansas.
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