1: Most Polluted City in the World - Los Angeles

2: Second Most Polluted - Fresno

3: Third Most Polluted - Bakersfield

4: Fourth Most Polluted - Sacramento

5: Fifth Most Polluted - San Diego

6: Sixth Most Polluted - San Francisco

7: Seventh Most Polluted - Houston

8: Eighth Most Polluted - Modesto

9: Ninth Most Polluted - Las Vegas

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