The 25 Most Polluted Cities in the US

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Sacramento-Roseville-Arden-Arcade, CA

  • High ozone days per year: 94
  • No. of days with unhealthy particle pollution: 6
  • People with asthma: 175,185
  • Population: 2,324,884

Rising temperatures and heat waves are partially to blame for the Sacramento area’s high ozone levels — as do automobile and freight vehicle emissions. Smoke from California’s frequent forest fires also contributes to days of extremely high particle pollution.

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