Carbon disulfide (CS2) exposure was assessed in several ways in a viscose fiber plant. Environmental exposure was measured by static area sampling and by personal monitoring using diffusive passive ORSA-5 Draeger badges. At the same time, as biological indicators of exposure the iodine-azide test (IAT) and 2-thiothiazolidine-4-carboxylic acid (TTCA) in urine samples obtained at the end of work shift were performed. The aim was to estimate the relationship between parameters of environmental exposure and biological indicators of internal exposure as well as to determine the influence of the exposure duration on urinary TTCA values. Environmental exposure determined by personal samplers as time-weighted average (TWA) concentrations was twice as high than when measured by static area sampling: 62.2 vs. 31.1 mg/m3 in the spinning rooms, and 18.3 vs 12.2 mg/m3 in the viscose manufacturing departments. The iodine-azide test showed high linear correlation with CS2, but only for very high CS2 values. In highly exposed spinners, higher urinary TTCA levels were found related to longer exposure to CS2, but without statistical significance. For TTCA levels in urine a high correlation coefficient existed, but in this case even for low CS2 levels. Using a linear regression equation, a biological limit value for TTCA which corresponds to the Yugoslav MAC of 30 mg/m3 for CS2 was calculated (9.89 mg/g creatinine) for the study population, which is higher than in other investigations.(ABSTRACT TRUNCATED AT 250 WORDS)