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Seasonal and spatial occurrence and distribution of atmospheric polycyclic aromatic hydrocarbons (PAHs) in rural and urban areas of the North Chinese Plain |
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| Authors: | Liu Shuzhen Tao Shu Liu Wenxin Dou Han Liu Yanan Zhao Jingyu Little Mark Gabriel Tian Zaifeng Wang Jingfei Wang Luguang Gao Yuan |
| Affiliation: | a Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China b Institute of Environment Science of Hebei Province, Shijiazhuang 050051, China c Central Environment Monitoring Station of Shijiazhuang, Shijiazhuang 050000, China |
| Abstract: | Passive air sampling (PAS) was employed to study the occurrence of gaseous and particle-bound PAHs in the North Chinese Plain. The averaged concentrations of gaseous and particle-bound PAHs were 485 ± 209 ng/m3 and 267 ± 161 ng/m3, respectively. The PAHs concentrations at urban sites were generally higher than those at rural ones with ratios <1.5 in spring, summer and fall, but differences between them were not significant for the wintertime and annually averaged concentrations. This urban-rural distribution pattern was related to the PAHs emission sources. PAHs spatial variation can be partially (49%) explained by emission with a simple linear regression method. Both the gaseous and particle-bound PAHs were highest in winter and lowest in summer, with winter/summer ratios of 1.8 and 8, respectively. Emission strength was the most important factor for the seasonality. |
| Keywords: | Passive air sampling Polycyclic aromatic hydrocarbons (PAHs) North Chinese Plain |
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