This paper describes both test facilities and methods designed to monitor volatile organic solvent exposure levels in simulated end-use environments. Variables relevant to exposure testing can be classified into three major categories: product systems, environmental conditions and application methods. Solvent exposure levels can be monitored during the product application periods and also during the decay periods to define the rate of dissipation from the enclosed area. The computer-assisted analysis of the data collected provides: the average solvent concentration in the test area, the average solvent concentration in the worker's breathing zone, solvent concentration decay rates, and information on the presence of concentration gradients. Data generated from this test facility should be useful in establishing guidelines for handling volatile organic solvents in various environments. -- AATA