Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 23
Articles | Volume 25, issue 23
https://doi.org/10.5194/acp-25-17747-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-17747-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 23
Measurement report
 | 
05 Dec 2025
Measurement report |  | 05 Dec 2025

Measurement report: High contribution of N2O5 uptake to particulate nitrate formation in NO2-limited urban areas

Ziyi Lin, Chuanyou Ying, Lingling Xu, Xiaoting Ji, Keran Zhang, Feng Zhang, Gaojie Chen, Lingjun Li, Chen Yang, Yuping Chen, Ziying Chen, and Jinsheng Chen

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Short summary
Based on field observations of N2O5, we found extremely high nighttime concentrations of N2O5, with a maximum value of 2.52 ppb. Further multiphase box model analysis revealed that the heterogeneous uptake of N2O5 is the most significant nitrate formation pathway in NO2-limited urban areas. Additionally, we further analyzed the reasons for this high N2O5 uptake contribution, and discussed the synergistic reduction of nitrates and O3.
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