There is no evidence of predisposition of underground miners to lung cancer or to any of the diseases evaluated. There is no reason to believe that the underground environment increases respiratory disease when known noxious agents such as pneumoconiosis producing dust or radon decay products are absent or present in only minute amounts. The inverse relationship between on the job fatal accidents and duration of employment for underground miners indicates the importance of intense employee education in area of safe work practices and adherence to those practices. Exposure to sodium (7440235) and potassium (7440097) dust in the potash industry did not influence mortality due to heart disease or cerebrovascular accidents. No excess mortality was attributable to the presence of diesel engines in some mines. A deficit of deaths from cancers other than respiratory among the surface workers could not be explained.
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