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Definition: In particularly hazardous conditions involving volatile or easily aerosolized toxicants, protective equipment may be necessary in addition to protective clothing. Such equipment includes closed-circuit air masks, gas masks, etc. In addition to personal items such as gas masks, industrial and agricultural processes may be designed specifically to reduce exposure; for example, closed systems for mixing pesticides have been developed to protect applicators, mixers and loaders.
Source: Macmillan Dictionary of Toxicology. Basingstoke: Macmillan Publishers Ltd, 1999. Credo Reference. Web. 03 September 2012.