A two-phase study was conducted to assess the suitability of passive monitoring for the collection of airborne vapor degreasing solvents under laboratory and field conditions. The laboratory stage of the investigation involved the determination of collection efficiencies for methyl chloroform (MC) and trichloroethylene (TCE). A 6920 L static chamber was used to establish standard atmospheres of these solvents at various concentrations, which were then sampled using passive monitors; samples were subsequently analyzed by gas-liquid chromatography. In the second part of the investigation, several MC and TCE vapor degreaser operations were monitored at US Army industrial plants. The purpose of the field study was to develop worker exposure prof iles and to obtain a side-by-side comparison of the passive monitor with the traditional charcoal tube sampler. Presented are statistically reduced data and the performance characteristics of both collection techniques.