Sequoia National Park: California Smog Threatens Ancient Trees
By TRACIE CONE 05/28/12 01:19 PM ET AP SEQUOIA NATIONAL PARK, California — The California forest that is home to the biggest and oldest living things on earth, the giant Sequoia redwoods, also suffers a dubious distinction.
Sequoia National Park: Worst air pollution
smog threatens trees at Sequoia National Park
List of US national parks with most smog, number of days that violated …