Date:
Location:
A China Project Research Seminar with Fengkui Duan, an associate professor at the School of Environment, Tsinghua University, China.
She earned her PhD in Environmental Science and Engineering from Tsinghua University. Her research concerns air pollution and its control, focusing on the characteristics and formation mechanisms of PM2.5. She analyzes inorganic and organic trace species in aerosols using various techniques.
Author or co-author of over 70 refereed publications in international journals and 3 books, her research has been funded by a number of Chinese sources including the National Science and Technology Program of China, the National Natural Science Foundation of China, and the National Research Program for Key Issues in Air Pollution Control. Her awards include：the State Natural Science Award of China (2009), the Natural Science Award of the Ministry of Education (2007), the Top-100 National Excellent Doctoral Dissertations in China (2007), as well as the Environmental Protection Science and Technology Award of Ministry of Environmental Protection of China (2007).
ABSTRACT: Research by Fengkui Duan, Tao Mao, Yang Shuo, Yongliang Ma, Hu Jun, Kebin He, School of Environment, Tsinghua University, Beijing 100084, China
With the implementation of emission control strategies and measures, ambient PM2.5 decreased remarkably in China during 2013-2018. It decreased more than 40% from 2013 (90 μg m-3) to 2018 (51 μg m-3) in Beijing. However, heavy haze pollution still occurred during typical winters, and tended to cover different sources and mechanisms: heterogeneous chemistry, homogeneous chemistry, regional transport and dust storms. Sulfate-nitrate-ammonium (SNA) and carbonaceous components were the major components. Single particle analysis showed complex mixing states of S-rich particles, in which sulfate was mixed with crustal and organic matter. Sulfate-organic mixed matter (SOM) was abundant in winter and summer, evolved and mixed with the increase of PM2.5 and RH, indicating different heterogeneous formation mechanisms.