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Characteristics and policy implications of PM2.5 changes in China and globally during the COVID-19 -- The 50th Teacher Development Center Forum was successfully held

On the morning of October 30th ,assistant professor Wang Yichen from the Department of Public Administration of Northwestern Polytechnical University was invited to the 50th Teacher Development Center Forum of the Business School of Nanjing Normal University. He brought a wonderful lecture to the teachers and students of our school. The theme of the lecture is “Characteristics and policy implications of PM2.5 changes in China and globally during the COVID-19”. Teacher Wu Rui and a number of students from Business school participated in the lecture.


Wang Yichen, Assistant Professor of the Department of Public Administration from Northwestern Polytechnical University, Doctor of Science, Postdoctoral of Theoretical Economics. His main research directions are air pollution prevention policy analysis and big data literature analysis. He has published papers in international journals such as Environmental International, Environmental Science &Technology, Energy Economics, Atmospheric Chemistry and Physics, Science of the Total Environment, and Chemosphere. Twelve of the published papers have been cited at least 12 times. He hosted the Youth Program of National Natural Science Foundation of China and obtained the first-class subsidy of China Postdoctoral Foundation.

At the beginning of the report, Professor Wang Yichen explained the impact of industry and transportation on air quality in China under COVID-19.Under the impact of the epidemic, many unnecessary factories have been closed, many public places have been closed, and road traffic has been significantly reduced. The air quality index in 32 provinces and cities, including Beijing and Shanghai, fell by an average of 20 percent during the period, resulting in an overall improvement in air quality. Reducing the impact of key industries on air quality should be a core part of pollution control efforts, Wang said, adding that plans to control residential emissions should be developed and implemented to prevent air pollution in winter in northern China. Afterwards, Professor Wang Yichen explained the change of PM2.5 pollution in the global environment during the COVID-19 blockade. During the COVID-19 lockdown, PM2.5 levels vary from continent to continent. The improvement of PM2.5 in developing countries was higher than that in developed countries. Finally, from the perspective of air pollution, according to the differences and effects of prevention and control measures in developed and developing countries under COVID-19, Professor Wang Yichen puts forward three enlightenments: First, the difference in PM2.5 concentration between developed and developing countries may be related to vehicle emission standards and industrial structure; Second, in order to solve PM2.5 pollution in developing countries, the emission of pollutants should be reduced. Third, in order to reduce PM2.5 pollution, developed countries should consider secondary pollutants.


In this lecture, Assistant Professor Wang Yichen actively interacted with the present students. In clear charts and humorous language, Professor Wang explained to them the changes of PM2.5 in China and around the world during the COVID-19 as well as relevant knowledge of policy enlightenment, and made detailed answers to the questions raised by the present students. This report will enable students to pay attention to the changes of PM2.5 at both international and domestic levels and the policy enlightenment, broaden students' horizons, and let students re-look at some theoretical and academic issues from the perspective of discipline integration.