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Black blizzards of dust a mile and a half rolled across the landscape , darkening the sky and whipping the earth into great drifts of dust that settled over hundreds of miles . Dust storms made it difficult for humans and livestock to breathe and destroyed crops and trees over vast areas. Dust storms turned day into night, terrifying those caught in them. "Dust pneumonia' and other respiratory infections afflicted thousands, and many travelers found themselves stranded in automobiles and trains unable to move. The worst storms occurred in the early spring of 1935.