Want to Live Longer? Get Out Of These 30 Most Polluted Cities in the US

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26. Louisville/Jefferson County, KY-IN

PM 2.5 – 10.5

PM 10 – 40

While Jefferson County had been one of 50 counties across the country that failed to meet federal health standards for fine particle pollution from 2011 to 2013, EPA has recently noted a significant improvement in air quality in the area. The area now meets the National Ambient Air Quality Standard (NAAQS) for sulfur dioxide set to protect public health. 

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