18 Cities With The Best Air Quality in the U.S.

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16. Casper, WY

Casper is the second largest city in Wyoming – after the capital – and has a booming oil industry much like the rest of Wyoming. The state’s nickname as the “Cowboy State” makes a lot of sense for this city, which prominently features cowboy culture. With the North Platte River and a view of the mountains in the distance, this city is a sight for sore eyes.

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