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UTAH VALLEY Located in Utah County of Contral Uatah,Third largest county in the state,Population of 258,000 in 1987,Five contiguous cities situated on the valley floor,Elevation of 1400 meters above sea level.Utah Valley PM from different year presented differential pulmonary toxicity in human volunteers,animals,and airway epithelial cells.Zinc plays a critical role in Utah Valley PM-induced pulmonary toxicity.