The Smoggiest Cities in America

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25. San Antonio-New Braunfels-Pearsall, TX
> Average high ozone days per year: 7.3
> Average 24-hour unhealthy particle pollution: 0.8
> Adults with asthma: 146,716
> Population: 2,611,111

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24. Detroit-Warren-Ann Arbor, MI
> Average high ozone days per year: 7.7
> Average 24-hour unhealthy particle pollution: 3.8
> Adults with asthma: 462,752
> Population: 5,323,779

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23. Redding-Red Bluff, CA
> Average high ozone days per year: 7.8
> Average 24-hour unhealthy particle pollution: 3.7
> Adults with asthma: 17,848
> Population: 243,521

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22. Albuquerque-Santa Fe-Las Vegas, NM
> Average high ozone days per year: 8.0
> Average 24-hour unhealthy particle pollution: 0.3
> Adults with asthma: 93,049
> Population: 1,165,181

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21. Reno-Carson City-Fernley, NV
> Average high ozone days per year: 9.7
> Average 24-hour unhealthy particle pollution: 12.2
> Adults with asthma: 48,994
> Population: 644,730

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