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This federal rule helped clear air over America's most beloved parks. Trump's EPA wants to kill it

Associated Press

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FILE - People wait for the trailhead at Glacier Point to re-open at Yosemite National Park, Calif., June 18, 2016. (AP Photo/Jacquelyn Martin, File)
FILE- Steam rises a the Norris Geyser Basin in Yellowstone National Park, Wyo., Spet. 2009. (AP Photo/Beth Harpaz, File)
FILE - Sheer cliffs rise at Zion National Park, near Springdale, Utah., Sept. 16, 2015. (AP Photo/Rick Bowmer, File)

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FILE - People wait for the trailhead at Glacier Point to re-open at Yosemite National Park, Calif., June 18, 2016. (AP Photo/Jacquelyn Martin, File)