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Petrified Forest-Painted Desert National Park in northeastern Arizona is about 200 miles and a mountain range away from Phoenix, Ariz. But Phoenix, with help from even more distant Los Angeles, is the primary cause of air pollution at the park. Download entire issue to view this article: http://www.hcn.org/issues/20.10/download-entire-issue
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by Joan Baeza, High Country News
May 23, 1988