The present study assessed the concentration of xylene and toluene in the working environment of paint manufacturers.
It was found that the concentration of xylene and toluene was below the TLV. The TWA of airborne xylene levels was 1.6 g/g creatinine,
the ACGIH-recommended biological exposure index for hippuric acid in urine. In this present study, workers who had
urinary hippuric acid higher than the BEI were working in jobs with high exposure potential, such as grinding pigment,
tank cleaner, paint sprayer, and filling paint into containers.