Safety of machinery. Evaluation of the emission of airborne hazardous substances. Capture efficiency of an exhaust system. Tracer method|Measurement, Particulate air pollutants, Air content determination, Air pollution, Equipment safety, Industrial air pollutants, Flow measurement, Testing conditions, Position, Tracer methods, Efficiency, Machines working without stock removal, Emission, Control of specific variables, Performance, Safety measures, Machines working by stock removal, Comparative tests, Reports, Exhaust systems, Occupational safety