Redwood Canyon, one of the world's largest giant sequoia groves, and the San Joaquin Valley
Redwood Canyon, one of the world's largest giant sequoia groves, and the San Joaquin Valley The Fresno Bee/MCT
Redwood Canyon, one of the world's largest giant sequoia groves, and the San Joaquin Valley The Fresno Bee/MCT

California air among nation’s dirtiest

April 24, 2013 12:00 AM