Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 5
Articles | Volume 26, issue 5
https://doi.org/10.5194/acp-26-3867-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-3867-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 5
Research article
 | 
18 Mar 2026
Research article |  | 18 Mar 2026

Rapid formation of hydroxymethyl hydroperoxide and its vital role in methanesulfonic acid-methylamine nucleation: impacts of urban industrial areas

Rongrong Li, Zeyao Li, Chengyan Zhang, Rui Wang, Jihuan Yang, Heran Cui, Xuanye Li, Nini Huo, and Tianlei Zhang

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Short summary
This study investigates the formation of hydroxymethyl hydroperoxide (HMHP) through methanesulfonic acid (MSA)-catalyzed hydrolysis of CH2OO in the gas phase and at the air-water interface. HMHP forms rapidly and stably in both environments. Further analysis shows that HMHP enhances the stability of MSA-methylamine (MA) clusters and highlights HMHP's key role in MSA-MA-HMHP nucleation, especially in urban and forested regions.
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