[Hygienic evaluation of chemical industry equipment placed at open sites].

Technical and design aspects of the arrangement of the equipment used in chemical production of nitrogen substances may cause pollution of workplace air and contamination of atmospheric air and soil of the sanitary and protective zones. Their concentration grows during repair works and may exceed MACs. In cold periods of the year the combined effect of ammonia, nitrogen dioxide and low temperature results in the decrease of olfactory sensitivity and nonspecific immunologic reactivity, an elevation of tension of the regulatory mechanisms and temporary disability rates.