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![Concomitant determination of PAH, PCBs, and phthalates in indoor air and dust from residential houses in the Strasbourg region of France](https://image.oaes.cc/a71efa62-42f1-44d9-8a12-98d805e30fc5/jeea2047.fig.3.jpg)
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.