On the basis of hygienic studies in foundries of nickel plants conditions for and character of the formation of industrial aerosols, their physico-chemical properties are studied. The data obtained indicate significant pollution in the occupational areas with ++nickel-containing aerosols. High carcinogenic risk has been shown to characterize the foundries. A dependence of workers' mortality due to malignant tumours on nickel and its compounds content in the air of occupational area has been shown. A complex of health-improving measures aimed at reducing oncological morbidity of workers in foundries of nickel plants is presented. A priority significance is attributed to application of new technological processes in production.