fig3

Figure 3. Variation of the concentrations of the PCBs detected in the air samples collected from (a) the bedroom and (b) the living room of the assessed houses [data are shown as average concentration of PCBs detected in the residences per month; *denote significant differences between the average PCBs in the two rooms based on paired t-test analysis of means (95% confidence level)]. PCBs: Polychlorinated biphenyls.