FRESNO, Calif. -- Amid the pines and incense cedar in Sequoia National Park, the five o'clock rush hour often is limited to squirrels, mule deer and the occasional skunk crossing the road.
Visitors see spectacular 13,000-foot peaks, the largest trees on the planet and far fewer idling cars than at Yosemite National Park.
So the downside here seems unbelievable: Sequoia's Ash Mountain entrance this year was the worst smog trap in the country.