gas - such as chlorine or carbon monoxide
liquid - such as degreasing solvent or cleaning chemicals
spray or mist - such as paint and epoxy sprays and acid mists
fumes - such as welding, hot rubber, soldering, galvanising fumes
vapour - such as solvent vapour released from adhesives, paints or inks
dust, powder or paste - such as wood, cement, metal, flour, grain, rubber or stone dust.
