The park enjoys relatively good air quality, but it is upwind of urban and industrial sources of air pollution. Air pollutants blown into the park can harm natural and scenic resources such as soils, surface waters, plants, wildlife, and visibility.
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From the deep canyons to the high plateaus of Zion roams a large, stealthy predator: the mountain lion, or cougar. Mountain lions can be six to nine feet long from nose to tip of tail, weighing 80-180 pounds.
Angels Landing has been recorded as one of the most dangerous public hikes in the United States. The top of the trail peaks off at a plateau, which is more than 1,000 feet high. But the most dangerous part of the hike involves a skinny land-bridge with a metal chain for guidance.
Pets can harass or harm wildlife by making noise or scaring wildlife away. The only trail that allows pets is the Pa'rus Trail, which begins at the Zion Canyon Visitor Center. Pets are not permitted - on any other trails, wilderness areas, on shuttle buses, or in public buildings in Zion.
The NPS has advised visitors against swimming or submerging their heads in the affected Zion waterways and warned people not to drink water from anywhere in the park. The watches and warnings extend to popular areas of the park, including The Narrows and Emerald Pools.
Victims can die if they aren't transported right away to a lower altitude, he says. Rob Wissinger, emergency medical services coordinator for Zion National Park, says altitude sickness at Zion is pretty rare.