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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-298
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-298
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  16 Apr 2020

16 Apr 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

2013–2019 increases of surface ozone pollution in China: anthropogenic and meteorological influences

Ke Li1, Daniel J. Jacob1, Lu Shen1, Xiao Lu1, Isabelle De Smedt2, and Hong Liao3,4 Ke Li et al.
  • 1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
  • 2Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
  • 3Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China
  • 4Harvard-NUIST Joint Laboratory for Air Quality and Climate, Nanjing University of Information Science and Technology, Nanjing, China

Abstract. Surface ozone data from the Chinese Ministry of Ecology and Environment (MEE) network show sustained increases across the country over the 2013–2019 period. Despite Phase 2 of Clean Air Action targeting ozone pollution, ozone was higher in 2018–2019 than in previous years. The mean summer 2013–2019 trend of maximum 8-h average (MDA8) ozone was 1.9 ppb a−1 across China and 3.3 ppb a−1 in the North China Plain (NCP). Fitting ozone to meteorological variables with a multiple linear regression model shows that meteorology played a significant but not dominant role in the 2013–2019 ozone trend, contributing 0.70 ppb a−1 across China and 1.4 ppb a−1 in the NCP. Higher June–July temperatures over the NCP were the main meteorological driver, particularly in recent years (2017–2019), and were associated with increased foehn winds. NCP data for 2017–2019 show a 15 % continuing decrease in fine particulate matter (PM2.5) and flat emissions of volatile organic compounds (VOCs), which would explain the continued anthropogenic increase in ozone. VOC emission controls, as targeted by Phase 2 of the Chinese Clean Air Action, are needed to reverse the increase of ozone.

Ke Li et al.

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Ke Li et al.

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Replication Data for: 2013–2019 increases of surface ozone pollution in China: anthropogenic and meteorological influences K.Li https://doi.org/10.7910/DVN/T6D7YY

Ke Li et al.

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Short summary
Surface summer ozone has been increasing in China over 2013–2019, despite new governmental efforts targeting ozone pollution. We find the ozone increase is mostly due to anthropogenic drivers, although meteorology also plays a role. Further analysis for North China Plain shows that PM2.5 continued to decrease through 2019 while emissions of volatile organic compounds (VOCs) stayed flat. This can explain the anthropogenic increase in ozone because PM2.5 scavenges the radical precursors of ozone.
Surface summer ozone has been increasing in China over 2013–2019, despite new governmental...
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