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any disease of the lung caused by chronic inhalation of dust, usually mineral dust of occupational or environmental origin. Some kinds of pneumoconioses are anthracosis, asbestosis, silicosis.
Much like miners, Dust Bowl residents exhibited signs of silicosis from breathing in the extremely fine silt particulates, which had high silica content. Dust pneumonia, called the âbrown plague,â killed hundreds and was particularly lethal for infants, children and the elderly. Many, but not all, of the Dust Bowl refugees hailed from Oklahoma.