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List of US national parks with highest smog levels
Sequoia National Park, home to the giant redwoods, suffers the worst air pollution of any national park in the country. Here are the parks in the National Park Service system with the highest smog levels and the number of days monitors recorded violations last year:— Sequoia National Park, Calif.: 87.— Joshua Tree National Park, Calif.: 56.— Great Smoky Mountains National Park,
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