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U.S. National Parks Have About as Much Ozone Pollution as the Country's Biggest Cities, Study Finds
An aerial view of sandstone formations May 2, 2012 in Bryce Canyon National Park, Utah. (Ethan Miller/Getty Images) At a Glance The air in U.S. national parks is as polluted with ozone as the air found in major cities, a new study found.Unhealthy ozone levels have persisted into the 2000s, even as ozone pollution has declined in recent decades.The study also found California's Sequoia National Park averages more days per year with unhealthy ozone levels than Los Angeles. Getting out...
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