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Home > 2009 > City Rankings

Cleanest U.S. Cities by Year Round Particle Pollution

Ozone | Short-Term Particle Pollution | Year-Round Particle Pollution

Least Polluted: Year-Round Particle Pollution
Click on a city below to learn more.


FACT: Some of the biggest sources of air pollution are dirty power plants, old diesel vehicles and heavy equipment, and ocean-going vessels.
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