A paradox for air pollution controlling in China revealed by "APEC Blue" and "Parade Blue".
A series of strict emission control measures were implemented in Beijing and surrounding regions to ensure good air quality during the 2014 Asia-Pacific Economic Cooperation (APEC) summit and 2015 Grand Military Parade (Parade), which led to blue sky days during these two events commonly referred to as "APEC Blue" and "Parade Blue". Here we calculated Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) and Ozone Monitoring Instrument (OMI) NO2and HCHO results based on well known DOAS trace gas fitting algorithm and WRF-Chem model (with measured climatology parameter and newest emission inventor) simulated trace gases profiles. We found the NO2columns abruptly decreased both Parade (43%) and APEC (21%) compared with the periods before these two events. The back-trajectory cluster analysis and the potential source contribution function (PSCF) proved regional transport from southern peripheral cities plays a key role in pollutants observed at Beijing. The diminishing transport contribution from southern air mass during Parade manifests the real effect of emission control measures on NO2pollution. Based on the ratios of HCHO over NO2we found there were not only limited the NO2pollutant but also suppress the O3contaminant during Parade, while O3increased during the APEC.
School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China.|Key Lab of Environmental Optics &Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Haoran
H
Liu
School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China.|Key Lab of Environmental Optics &Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.|Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Cheng
C
Liu
School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China.|Key Lab of Environmental Optics &Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.|Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Zhouqing
Z
Xie
Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Ying
Y
Li
Institute for Climate and Global Change Research &School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China.|Collaborative Innovation Center of Climate Change, Jiangsu Province, China.
Xin
X
Huang
Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, 28006, Spain.
Shanshan
S
Wang
Key Lab of Environmental Optics &Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Jin
J
Xu
Key Lab of Environmental Optics &Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.|Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Pinhua
P
Xie
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