Planning to visit any national parks this summer? If so, a report out Thursday stamps a stigma on five that it labels as having the worst air quality in the system of 388 national parks.
Authored by the National Parks Conservation Association and two smaller groups, the report concludes that air quality in the national parks has not improved even though Congress tightened the Clean Air Act in 1990.
That poor quality affects not only views, the activists noted, but can have long-term, detrimental health effects on plants, trees and animals.
Using haze, acid precipitation and ozone, also known as smog, as their criteria, the groups ranked these five parks in order of having the worst air quality:
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