Safety of machinery. Evaluation of the emission of airborne hazardous substances. Separation efficiency by mass, ducted outlet|Dust control, Industrial air pollutants, Emission, Dangerous materials, Air pollution, Smoke, Equipment safety, Separation methods (chemical analysis), Fumes, Occupational safety, Smoke control, Fume extraction systems, Efficiency, Safety measures, Vapours, Particulate air pollutants, Air-conditioning systems, Machines working without stock removal, Mist, Machines working by stock removal, Gas cleaning equipment, Air cleaning equipment, Dust collectors