Articles | Volume 18, issue 10
https://doi.org/10.5194/acp-18-7423-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-18-7423-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Fine-particle pH for Beijing winter haze as inferred from different thermodynamic equilibrium models
School of Engineering and Applied Sciences, Harvard University,
Cambridge, Massachusetts 02138, USA
School of Engineering and Applied Sciences, Harvard University,
Cambridge, Massachusetts 02138, USA
Weiqi Xu
State Key Laboratory of Atmospheric Boundary Physics and Atmospheric
Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences,
Beijing 100029, China
Jingyuan Shao
Laboratory for Climate and Ocean-Atmosphere Studies, Department of
Atmospheric and Oceanic Sciences, School of Physics, Peking University,
Beijing 100871, China
Department of Atmospheric Sciences, University of Washington, Seattle,
Washington 98195, USA
Guoliang Shi
State Environmental Protection Key Laboratory of Urban Ambient Air
Particulate Matter Pollution Prevention and Control, College of
Environmental Science and Engineering, Nankai University, Tianjin 300071,
China
Shuxiao Wang
State Key Joint Laboratory of Environmental Simulation and Pollution
Control, School of Environment, Tsinghua University, Beijing 100084, China
Yuxuan Wang
Department of Earth and Atmospheric Sciences, University of Houston,
Houston, Texas 77004, USA
Department of Earth System Science, Tsinghua University, Beijing
100084, China
State Key Laboratory of Atmospheric Boundary Physics and Atmospheric
Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences,
Beijing 100029, China
University of Chinese Academy of Sciences, Beijing 100049, China
Michael B. McElroy
CORRESPONDING AUTHOR
School of Engineering and Applied Sciences, Harvard University,
Cambridge, Massachusetts 02138, USA
Department of Earth and Planetary Sciences, Harvard University,
Cambridge, Massachusetts 02138, USA
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Latest update: 05 Oct 2024
Short summary
Severe haze events occur frequently over northern China, especially in winter. Acidity plays a critical role in the formation of secondary PM2.5 and its toxicity. Using field measurements of gases and particles to critically evaluate two thermodynamic models routinely employed to determine particle acidity, we found that China's winter haze particles are generally within a moderately acidic range (pH 4–5) and not highly acidic (0) or neutral (7) as has been previously reported in the literature.
Severe haze events occur frequently over northern China, especially in winter. Acidity plays a...
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