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. And that can spell bad news for your long term respiratory and overall health. If you're concerned about things like that, you might want to give pause before packing up and moving to these affected areas. Here's a list of the highest risk areas in the United States.