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occupational hygiene industrial hygiene occupational health & safety occupational health bohs control hazardous substances construction breathefreely thermal environment occupational illness heat stress physical agents occupational disease welding presentation design occupational safety and health health and safety coshh occupational_hygiene toxicology chemical hazards local exhaust ventilation silica welding fume labelling clp communicating science powerpoint communication thermal comfort dust ghs health_and_safety occupational pollution ultraviolet radiation infrared radiation safety non-ionising radiation radio frequency hazards environment electromagnetic radiation health non-ionizing radiation hygiene phs wbgt health risk management construction dust health hazards rpe respiratory protection respiratory disease cancer carcinogens presentations exposure assessment sampling methods sulphuric acid solvents vocs threshold limit values tlvs ear defenders noise at work hearing protection noise hearing hsg258 lev coshh essentials risk assessment