Long-term monitoring and source apportionment of PM_2.5/PM₁₀ in Beijing, China

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• 作者：Hailin WANG ; Yahui ZHUANG ; Ying WANG ; Yele SUN ; Hui YUAN ; Guoshun ZHUANG ; Zhengping HAO
• 关键词：PM_2.5 ; PM₁₀ ; monitoring ; source apportionment
• 刊名：Journal of Environmental Sciences
• 出版年：2008
• 出版时间：2008
• 年：2008
• 卷：20
• 期：11
• 页码：1323-1327
• 全文大小：147 K

文摘

During 2001–2006, PM_2.5 (particle matter with aerodynamic diameter less than 2.5 microns) and PM₁₀ (particle matter with aerodynamic diameter less than 10 microns) were collected at the Beijng Normal University (BNU) site, China, and in 2006, at a background site in Duolun (DL). The long-term monitoring data of elements, ions, and black carbon showed that the major constituents of PM_2.5 were black carbon (BC) crustal elements, nitrates, ammonium salts, and sulfates. These five major components accounted for 20 % –80 % of the total PM_2.5. During this period, levels of Pb and S in PM remained rather high, as compared with the levels in other large cities in the world. Source apportionment results suggest that there were 6 common sources for PM_2.5 and PM₁₀, i.e., soil dust, vehicular emission, coal combustion, secondary aerosol, industrial emission, and biomass burning. Coal combustion was the largest contributor of PM_2.5 with a percentage of 16.6 % , whereas soil dust played the most important role in PM₁₀ with a percentage of 27 % . In contrast, only three common types of sources could be resolved at the background DL site, namely, soil dust, biomass combustion, and secondary aerosol from combustion sources.