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| Sources and correlations of outdoor and indoor particle-bound polycyclic aromatic hydrocarbons (PAHs) in a community in Tianjin, China |
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Abstract In order to investigate the sources contributions and correlations of indoor and outdoor PAHs bound onto inhalable particulate mater (PM10), PM10 samples were simultaneously collected indoors and outdoors at 36 households in a community in Tianjin during the non-heating period (NHP) and heating period (HP) in 2009; concentrations of 12individual PAHs were measured. Indoor PAH concentrations in NHP were comparable to outdoor concentrations, but lower than outdoors in HP. Indoor individual PAH contributions to total PAHs mass were comparable to outdoor PAH contributions in NHP, but not in HP. The average indoor/outdoor (I/O) ratio in both sampling periods was less than 1, but was higher in NHP than in HP. Smoking, cooking and cleaning activities did not significantly affect the indoor PAH concentrations. Indoor of 5-7ring PAHs were mainly derived from outdoor sources, while the 2-4ring PAHs were mainly from indoor sources. The infiltration factors of PM10-bound PAHs were 0.73 in NHP and 0.51 in HP. Diagnostic ratios for PAHs showed that the dominant sources of PAHs were coal combustion and traffic emissions.
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Received: 14 August 2014
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