Looking for a little fresh air on your next trip?

The American Lung Association estimates that more than one-third of Americans are exposed to potentially life-shortening air pollution and that nearly 120 million Americans live in areas with a failing grade for particle or ozone pollution.

More than 7,800 locations were ranked on their air quality.

The five US cities with the most polluted air are Coraopolis, Pennsylvania, Forest Park, Georgia, Cave Junction, Oregon, Happy Camp, California, and Adrian, Michigan.

The most populated US city with the least polluted air is Las Vegas.