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FILE--In this May 11, 2012, file photo, Sequoia National Park air resource specialist Annie Esperanza explains how ozone diminishes the view from Beetle Rock in Sequoia National Park, Calif. A new study concludes visitors may be steering clear of some U.S. national parks or cutting their visits short because of pollution. (AP Photo/Tracie Cone, 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.