**Table 2.**

*Occupational exposure limit values developed from different countries for trichloroethylene and perchloroethylene.*

column (DB-23) features are length = 60 m, inner diameter = 0.32 mm, and film thickness = 0.25 μm. The temperature of injection is 200°C and the oven program is the following: 35°C (3 min), 7.5°C/min, 115°C (0 min), 15°C/min, 200°C (2 min). The vector gas is nitrogen with a flow rate of 2 ml/min. We adopted external calibration using the same solvent as for the samples [19, 20, 23]. Then, the air concentrations of both solvents were calculated using the airflow rates and sampling durations [24].
