UNCERTAINTY ANALYSIS IN THE ESTIMATION OF EXPOSURE

This article addresses the ubiquitous nature of uncertainty in industr ial hygiene-related risk assessment and defines two basic types of unc ertainly: natural variability and a basic lack of knowledge. A relativ ely simple physical-chemical modeling example is provided as an illust ration in which uncertainty and sensitivity are described using two me thods, a conventional technique and a readily available and user-frien dly computer simulation software. The need for and Value of monitoring data for validation and as a ''reality check'' is emphasized.