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FILE--In this file photo taken Aug. 2, 2015, 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. A new study concludes visitors may be steering clear of some U.S. national parks or cutting their visits short because of pollution.(Emery Cowan/Arizona Daily Sun via AP, file)
Sign up for new weekly newsletter Closing Arguments to get the latest about ongoing trials, major litigation and hot cases and rulings in courthouses around the U.S. and the world.