Passive Sampling : Collecting samples of an airborne contaminant by exposing a medium to the contaminated air. As opposed to active sampling, there is no moving parts in a passive sampling process
Martin Ralph (Managing Director, IFAP), Industrial Foundation for Accident Prevention (IFAP): Safer Healthier Workplace, IFAP Glossary of Terms, 4th Ed. Willetton Western Australia 2010. http://www.ifap.asn.au/Documents/courseinfo/IFAP_G lossary_of_Terms.pdf, (IndS - Brit) {633}