Study: National parks get fewer visits when pollution rises

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Study: National parks get fewer visits when pollution rises

Nate Powell, an employee with Grand Canyon National Park, collects an entrance fee as traffic is backed up as vehicles arrive at an entrance gate at Grand Canyon National Park, Ariz., on Aug. 2, 2015. A new study concludes visitors may be steering clear of some U.S. national parks or cutting their visits short because of pollution.
The main plant facility at the Navajo Generating Station northeast of Grand Canyon National Park as seen from Lake Powell in Page, Ariz., on Sept. 4, 2011. A new study concludes visitors may be steering clear of some U.S. national parks or cutting their visits short because of pollution.

Study: National parks get fewer visits when pollution rises

Nate Powell, an employee with Grand Canyon National Park, collects an entrance fee as traffic is backed up as vehicles arrive at an entrance gate at Grand Canyon National Park, Ariz., on Aug. 2, 2015. A new study concludes visitors may be steering clear of some U.S. national parks or cutting their visits short because of pollution.
The main plant facility at the Navajo Generating Station northeast of Grand Canyon National Park as seen from Lake Powell in Page, Ariz., on Sept. 4, 2011. A new study concludes visitors may be steering clear of some U.S. national parks or cutting their visits short because of pollution.
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