The 25 Most Polluted Cities in the US

© beklaus / Getty Images

Denver-Aurora-Lakewood, CO

  • High ozone days per year: 54
  • No. of days with unhealthy particle pollution: 3
  • People with asthma: 251,385
  • Population: 2,888,227

The oil and gas industry in the state is hugely responsible for the Denver metro area’s large share of ozone pollution, but so are residents’ vehicles. Denver’s Mobility Action Plan aims to reduce car-commuting and increase the use of public transportation.

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