Adrian L. Linch 
Evaluation Ambient Air Quality By Personnel Monitoring 
Volume 1: Gases and Vapors

Personnel monitoring is a term designating the determination of the inhaled dose of an airborne toxic material of an air-mediated hazardous physical force by the continuous collection of samples in the breathing or auditory zone, or auditory zone, or other appropriate exposed body area, over a finite period of exposure time. A personnel monitor is a self-powered device worn by monitored individual to collect a representative sample of laboratory analysis, or to provide accumulated dose of instantaneous warning of immediately hazardous conditions by visible or auditory means while being worn.