Table 3: Measurement results of the field study: tetrachloroethene in end-exhaled air in exposed (dry-cleaning workers) and nonexposed (control group) subjects.

SubjectTetrachloroethene conc. in end-exhaled airSampling conditions
ActivitySample ASample B Temp.
NumberStatus(µg/L)(hPa)(°C)

1ExposedDyeing 7.67.910109.4
2ExposedMachine operating 16.716.710109.4
3ExposedTagging/inspecting 5.95.610109.4
4ExposedPressing3.43.5101111.0
5–14Control<LOQ<LOQ1016 to 102011.5 to 18.0

: ambient pressure; Temp.: ambient temperature.