25 Most Polluted Cities

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Source: Thinkstock

25. Chico, CA
> High ozone days per year: 8.2
> Number of days with unhealthy particle pollution: 9.3
> People with asthma: 17,218
> Population: 225,411

Source: Thinkstock

24. Sheboygan, WI
> High ozone days per year: 8.8
> Number of days with unhealthy particle pollution: N/A
> People with asthma: 10,377
> Population: 115,569

Source: Thinkstock

22. Baton Rouge, LA
> High ozone days per year: 9.0
> Number of days with unhealthy particle pollution: 8.9
> People with asthma: 69,067
> Population: 830,480

Source: Thinkstock

22. Philadelphia-Reading-Camden, PA-NJ-DE-MD
> High ozone days per year: 9.0
> Number of days with unhealthy particle pollution: 9.6
> People with asthma: 688,215
> Population: 7,183,479

Source: Thinkstock

21. Hartford-West Hartford, CT
> High ozone days per year: 10.8
> Number of days with unhealthy particle pollution: 7.3
> People with asthma: 159,585
> Population: 1,483,187