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California's National Parks Have Bad Air Pollution
San Joaquin County, California (in the central valley)

Sequoia National Park is nation's smoggiest      web

webhttp://www.mercurynews.com/2012/05/28/sequoia-smog-damaging-pines-redwood-seedlings-2/
authorTracie Cone
publicationSan Francisco Chronicle
date2012-05-28

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