The article contains a hygienic assessment of the USSR developed technological processes for ferrochromium slag self-separating. It was established that the major hazardous factor in the environmental conditions was the high-grade chromium-containing slag aerosol influencing most unfavourably the workers' health state, thus causing high-level morbidity with temporary disability. Preventive screening would predominantly reveal chronic bronchitis and allergic dermatoses with a less prevalence of pneumoconiosis. The forms of occupational toxic dust bronchitis characteristic of this particular group exhibited some clinical and functional peculiarities caused by a complex action of chromium and alkali.