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The authors present complex hygienic characteristics of work conditions for workers engaged into metallurgic process of ferrovanadium production. Chemical factors were shown as having complex influences. Occupational risk for the workers' health was estimated. Categories of a priori occupational risk for workers are valued from average (considerable) risk to very high (intolerable) risk. Factors that are priorities for development of occupationally induced diseases are disclosed. Reliable cause-effect relationships between working environment factors and the workers' diseases are determined. Work conditions appeared to play considerable role in respiratory tract diseases (average degree of occupational conditionality). Differences between workshops in fractional composition and concentration of dust, as major components of occupational factors complex, develop pathologic changes in various levels of respiratory system.
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