Characterization of ambient-generated exposure to fine particles using sulfate as a tracer in the Chinese megacity of Guangzhou
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摘要Total personal exposures can differ from the concentrations measured at stationary ambient monitoring sites. To provide further insight into factors affecting exposure to particles, chemical tracers were used to separate total personal exposure into its ambient and non-ambient components. Simultaneous measurements of ambient and personal exposure to fine particles (PM2.5) were conducted in eight districts of Guangzhou, a megacity in South China, during the winter of 2011. Considerable significant correlations (Spearman's Rho, rs) between personal exposures and ambient concentrations of sulfate (SO42 −; rs > 0.68) were found in contrast to elemental carbon (EC; rs > 0.37). The average fraction of personal SO42 − to ambient SO42 − resulting in an adjusted ambient exposure factor of α = 0.72 and a slope of 0.73 was determined from linear regression analysis when there were minimal indoor sources of SO42 −. From all data pooled across the districts, the estimated average ambient-generated and non-ambient-generated exposure to PM2.5 were 55.3 μg/m3 (SD = 23.4 μg/m3) and 18.1 μg/m3 (SD = 29.1 μg/m3), respectively. A significant association was found between ambient-generated exposure and ambient PM2.5 concentrations (Pearson's r = 0.51, p < 0.001). As expected, the non-ambient generated exposure was not related to the ambient concentrations. This study highlights the importance of both ambient and non-ambient components of total personal exposure in the megacity of Guangzhou. Our results support the use of SO42 − as a tracer of personal exposure to PM2.5 of ambient origin in environmental and epidemiological studies.
出版社接受日期13.10.2016
著者Xiao-Cui Chena, Heiko J. Jahn, Guenter Engling, Tony J. Ward, Alexander Kraemer, Kin-Fai Ho, Chuen-Yu Chan
期刊名稱Science of the Total Environment
出版年份2017
月份2
日期15
卷號580
出版社ELSEVIER
頁次347 - 357
國際標準期刊號0048-9697
電子國際標準期刊號1879-1026
語言美式英語
關鍵詞Environmental monitoring, Personal exposure, Fine aerosol particles (PM2.5), SO42 −, EC

上次更新時間 2020-20-10 於 03:19