Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 4
Articles | Volume 26, issue 4
https://doi.org/10.5194/acp-26-2425-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-2425-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 4
Research article
 | 
17 Feb 2026
Research article |  | 17 Feb 2026

Decadal transition of summertime PM2.5–O3 coupling and secondary organic aerosol dominance in northwest China

Wei Zhou, Liu Yang, Siqi Zeng, Yunping Kan, Lirong Yang, Weihong Zhang, Weijie Wang, Zijun Zhang, Yan Li, Weiqi Xu, Yucheng Gu, Yaozong Wang, Zhengyan Zuo, Jie Li, Zifa Wang, and Yele Sun

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Short summary
Northwest China, situated in an arid and semi-arid climate region; air quality issues in this area have received less attention compared to other Chinese metropolitan clusters.  This research identify a significant shift towards the coupling PM2.5 and O3 relationships over the past decade in northwest China, highlighting the great importance of urban terpenes and aromatic oxidation in secondary organic aerosol formation. 
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