Articles | Volume 18, issue 10
Atmos. Chem. Phys., 18, 7423–7438, 2018
https://doi.org/10.5194/acp-18-7423-2018
Atmos. Chem. Phys., 18, 7423–7438, 2018
https://doi.org/10.5194/acp-18-7423-2018

Research article 28 May 2018

Research article | 28 May 2018

Fine-particle pH for Beijing winter haze as inferred from different thermodynamic equilibrium models

Shaojie Song et al.

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AR by Svenja Lange on behalf of the Authors (13 Apr 2018)  Author's response
ED: Publish as is (07 May 2018) by David Topping
AR by Shaojie Song on behalf of the Authors (07 May 2018)  Author's response    Manuscript
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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.
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