The 25 Most Polluted Cities in the US

© Daniel Stein / Getty Images

Los Angeles-Long Beach-Anaheim, CA

  • High ozone days per year: 137
  • No. of days with unhealthy particle pollution: 13
  • People with asthma: 1,004,601
  • Population: 13,353,907

A notoriously smoggy area prone to thermal inversions, the Los Angeles metro area is the second most polluted in the nation. High ozone levels persist for more than a third of the year, with the warm climate contributing to ozone formation.

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