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The 25 most dangerously polluted cities in the US

More than 125 million Americans live in counties with unhealthy levels of air pollution, according to the 2017 "State of the Air" report, released April 19.

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More than 125 million Americans live in counties with unhealthy levels of air pollution, according to the American Lung Association's 2017 "State of the Air" report.

Pollution leads to various kinds of nasty health outcomes, including asthma, lung cancer, and shortened lifespans.

The report, released April 19, rounds up air quality data from 2013, 2014, and 2015 in the United States. (Because air quality data is plentiful and complicated, the annual ALA reports usually look two years into the past.)

The report focuses on two key kinds of pollution: particles and ozone.

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Particles include everything from dust kicked up during a drought to tiny particles floating in the air from forest fires or fossil fuels. Ozone, or smog, develops in the upper atmosphere when emissions from tailpipes and smokestacks cook in the sun's heat.

25. Erie, Pennsylvania

22 (tied). New York, New York

22 (tied). Harrisburg, Pennsylvania

22 (tied). Birmingham, Alabama

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20 (tied). Cincinnati, Ohio

20 (tied). Lancaster, Pennsylvania

18 (tied). Altoona, Pennsylvania

18 (tied). Detroit, Michigan

17. Fairbanks, Alaska

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16. Houston, Texas

13 (tied). Johnstown, Pennsylvania

13 (tied). Louisville, Kentucky

13 (tied). Indianapolis, Indiana

11 (tied). Philadelphia, Pennsylvania

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11 (tied). Medford, Oregon

10. San Luis Obispo, California

9. Cleveland, Ohio

8. Pittsburgh, Pennsylvania

7. El Centro, California

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6. Modesto, California

5. Los Angeles, California

4. San Francisco, California

3. Fresno, California

2. Bakersfield, California

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1. Visalia, California

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