15 American Cities with the Worst Air Pollution

According to the American Lung Association (ALA), over 50% of Americans live in counties that have unhealthy levels of ozone or pollution particulates in the air. Here's a list of the highest risk areas in the United States! 

Los Angeles- Long Beach, CA

It's gorgeous and sunny, but Los Angeles-Long Beach is ranked #1 out of 228 metro areas in high ozone days and #4 for annual particle pollution out of 171 metro areas by the ALA.

Image via: Flickr

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