A hazardous substance or hazardous micro-organism that occurs in the form of any fume, mist, gas, dust, vapour, smoke or aerosol contaminant
NSW Business Chamber, Workplace OHS, Glossary, North Sydney, NSW, Australia 2012. http://www.workplaceohs.com.au/Glossary.asp, (Occupn Hlth and Sfty - Brit) {537}