PM2.5 Background Concentration at Different Directions in Beijing in 2013

LI Yun-ting1 CHENG Nian-liang1 ZHANG Da-wei1 SUN Rui-wen1 DONG Xin1 SUN Nai-di1 CHEN Chen1

(1.Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Environmental Monitoring Center, Beijing, China 100048)

【Abstract】PM2.5 background concentration at different directions in 2013 in Beijing was analyzed combining the techniques of mathematical statistics, physical identification and numerical simulation (CMAQ4.7.1) as well as using monitoring data of six PM2.5auto-monitoring sites and five meteorological sites in 2013. Results showed that background concentrations of PM2.5 at northwest, northeast, eastern, southeast, southern and southwest boundary sites were between 40.3 and 85.3 μg·m3 in Beijing. From the lowest to the highest, PM2.5 background concentrations at different sites were: Miyun reservoir, Badaling, Donggaocun, Yufa, Yongledian and Liulihe. Background concentration of PM2.5 was the lowest under north wind, then under west wind,and significantly higher under south and east wind. Calculated PM2.5 background average concentrations were 6.5–27.9, 22.4–73.4, 67.2–91.7, 40.7–116.1 μg·m3 respectively in different wind directions. Simulated PM2.5 background concentration showed a clear north-south gradient distribution and the surrounding area had a notable effect on the spatial distribution of PM2.5 background concentration in 2013 in Beijing.

【Keywords】 Beijing; PM2.5; trimming average; background concentration; simulation; 2013;


【Funds】 Science and Technology Program of Beijing (Z131100006113009) Special Scientific Research Fund for Environmental-protective Public Welfare Profession of China (2014090055) National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2014BAC23B03) Beijing Air-Quality Standardization Program (Z131100005613046)

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This Article


CN: 11-1895/X

Vol 36, No. 12, Pages 4331-4339

December 2015


Article Outline


  • 1 Material and method
  • 2 Results and discussion
  • 3 Conclusions
  • References