The 25 most dangerously polluted cities in the US

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25. Erie, Pennsylvania

25. Erie, Pennsylvania
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22 (tied). New York, New York

22 (tied). New York, New York
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22 (tied). Harrisburg, Pennsylvania

22 (tied). Harrisburg, Pennsylvania

22 (tied). Birmingham, Alabama

22 (tied). Birmingham, Alabama
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20 (tied). Cincinnati, Ohio

20 (tied). Cincinnati, Ohio

20 (tied). Lancaster, Pennsylvania

20 (tied). Lancaster, Pennsylvania
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18 (tied). Altoona, Pennsylvania

18 (tied). Altoona, Pennsylvania

18 (tied). Detroit, Michigan

18 (tied). Detroit, Michigan
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17. Fairbanks, Alaska

17. Fairbanks, Alaska

16. Houston, Texas

16. Houston, Texas
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13 (tied). Johnstown, Pennsylvania

13 (tied). Johnstown, Pennsylvania

13 (tied). Louisville, Kentucky

13 (tied). Louisville, Kentucky
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13 (tied). Indianapolis, Indiana

13 (tied). Indianapolis, Indiana

11 (tied). Philadelphia, Pennsylvania

11 (tied). Philadelphia, Pennsylvania
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11 (tied). Medford, Oregon

11 (tied). Medford, Oregon

10. San Luis Obispo, California

10. San Luis Obispo, California
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9. Cleveland, Ohio

9. Cleveland, Ohio

8. Pittsburgh, Pennsylvania

8. Pittsburgh, Pennsylvania
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7. El Centro, California

7. El Centro, California

6. Modesto, California

6. Modesto, California
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5. Los Angeles, California

5. Los Angeles, California

4. San Francisco, California

4. San Francisco, California
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3. Fresno, California

3. Fresno, California

2. Bakersfield, California

2. Bakersfield, California
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1. Visalia, California

1. Visalia, California