Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 13
Articles | Volume 26, issue 13
https://doi.org/10.5194/acp-26-9453-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-9453-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 13
Research article
 | 
06 Jul 2026
Research article |  | 06 Jul 2026

Elevated foehn exacerbates surface ozone pollution in summer Beijing

Zhiheng Liao, Jing Xu, Ju Li, Liyan Zhou, Chao Liu, Lin Wu, and Zhiqiang Ma

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Short summary
We discovered that warm, dry winds flowing over mountains – a phenomenon known as elevated foehn – are a key driver of severe summer ozone pollution in Beijing. Unlike shallow foehn that can clear the air, these higher-altitude winds trap and intensify ozone pollution. They work in three ways: by heating the air to boost ozone formation, by lowering the ceiling of the mixing layer to concentrate pollutants, and by slowing winds to prevent their dispersal.
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