Well, I couldn’t find a definitive park with the “best” air quality, although the Great Basin National Park in Nevada is reported by federal agencies to be among the top, as well as Denali in Alaska. What was easy to find, however, was the 10 parks with the worst air quality: http://www.msnbc.msn.com/id/5281910/
Still, a 10 year study shows the general air quality to be improving. Awareness is the first step.
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