Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 18
Articles | Volume 26, issue 18
https://doi.org/10.5194/acp-26-13253-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-13253-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 18
Research article
 | 
22 Sep 2026
Research article |  | 22 Sep 2026

An underappreciated cyclonic-like circulation affects high summer ozone in North China Plain

Wenhao Qiao, Xipeng Jin, Xi Chen, Ziyu Long, Zhenjiang Yang, Lei Chen, Ke Li, and Hong Liao

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Short summary
Ground-level ozone is a major summer air pollution problem in the North China Plain. We found that a previously overlooked cyclonic-like circulation causes nearly one-third of ozone pollution days. It favors warm and dry foehn winds that increase ozone levels. This circulation has become more frequent over recent decades. Emission control measures should be designed according to the prevailing circulation patterns to achieve the most effective ozone mitigation.
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