Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 22
Articles | Volume 25, issue 22
https://doi.org/10.5194/acp-25-16679-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-16679-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 22
Measurement report
 | 
25 Nov 2025
Measurement report |  | 25 Nov 2025

Measurement report: Anthropogenic activities reduction suppresses HONO formation: direct evidence for secondary pollution control

Mingzhu Zhai, Shengrui Tong, Wenqian Zhang, Hailiang Zhang, Xin Li, Xiaoqi Wang, and Maofa Ge

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Latest update: 15 Aug 2026
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Short summary
To explore how anthropogenic activities affect HONO formation, we conducted comprehensive observations in Beijing. During clean periods with a 53 % drop in Traffic Performance Index, HONO, CO, and NO2 levels decreased by 2–3 times compared to polluted periods. Emission reduction simulations showed that a 50 % NOx reduction could lower HONO by up to 46.3 %, indicating that reducing anthropogenic activities significantly suppresses HONO formation and provides direct evidence for pollution control.
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