Seven gaseous polycyclic aromatic hydrocarbons (PAHs) were determined in the indoor air of 38 folk houses in Beijing during the heating and non-heating seasons, by the passive air samplers. The total average concentration of the gaseous PAHs was around 100 ng/m3, and the dominant components were those with 2 or 3 rings. The inhalation exposure of PAHs by the residents was calculated based on the concentrations of PAHs acquired, average house-staying time and respiratory rates at different ages. The calculated results indicated that, the potential total exposure rates of the seven gaseous PAHs for the adults (including senior people) during the heating and non-heating periods were 66 ng/h and 58 ng/h, respectively; while those for juvenile people were 56 ng/h and 50 ng/h, respectively.
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