The 25 Most Polluted Cities in the US

© Campwillowlake / Getty Images

Houston-The Woodlands-Sugar Land, TX

  • High ozone days per year: 52
  • No. of days with unhealthy particle pollution: 1
  • People with asthma: 445,024
  • Population: 6,892,427

Houston’s climate and its car-dependent culture, coupled with the area’s petrochemical facilities, shipping channel, and busy interstate, create an ozone problem that blankets the metro area in smog.

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