Hydrogen chloride decay, defined as the deposition of hydrogen chloride from fire (and other) atmospheres onto surfaces, has been studied as a function of atmospheric humidity, of size or configuration of the apparatus used, of type of surface in the apparatus and of rate of air movement. This decay means that, in a static system with a sorptive surface, hydrogen chloride has a half-life of 3 min or less, before disappearing from the atmosphere. A simplified mechanism has been devised to identify reactions which simulate the processes involved in hydrogen chloride generation, transport and decay. Mathematical fitting of the hydrogen chloride concentration-time profiles obtained from a large-scale and two small-scale apparatuses was carried out. The "parameters" calculated in this way have been used as a method for screening system vari ables and identifying dependencies.
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