The sources and seasonal variations of organic com

Authors: Yilun Jiang Ximei Hou Guoshun Zhuang Juan Li Qiongzhen Wang Rong Zhang Yanfen Lin

Publish Date: 2010/02/23

Volume: 62, Issue: 3, Pages: 175-192

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Abstract

Fine aerosol samples were collected throughout spring summer and winter in 2004∼2005 at a major urban traffic junction BNU and a suburban location MY in Beijing and at a downtown site SH in Shanghai China Ten of the 16 EPA priority polycyclic aromatic hydrocarbons PAHs seven fatty acids levoglucosan and cholesterol were identified and quantified PAHs detected in Beijing and Shanghai were up to one order of magnitude higher than those reported in the developed countries either in urban or suburban areas while levoglucosan was one order of magnitude lower than that in other countries for no biomass combustion in domestic heating in the megacities in China PAHs showed the same seasonal trend in all sampling sites as the highest in winter and the lowest in summer while fatty acids no pronounced seasonal variation A significant fraction of levoglucosan from cooking with higher concentrations in urban than in suburban area contributed to the ambient atmosphere indicating that the main source of levoglucosan in urban environment would be cooking rather than biomass burning The relative contributions of coal combustion and vehicle exhaust sources to PAHs in fine aerosols were preliminarily estimated to be 12 in Beijing and 11 in Shanghai revealing that the air pollution in these megacities in China was mainly the mixing of coal combustion with vehicle exhaust Cooking was one of the major sources of organic aerosols in both Beijing and Shanghai

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