Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 8
Articles | Volume 26, issue 8
https://doi.org/10.5194/acp-26-5747-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/acp-26-5747-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 8
Research article
 | 
28 Apr 2026
Research article |  | 28 Apr 2026

Long-term mercury isotope evidence for a shift toward background-dominated urban atmospheric mercury in North China under sustained emission controls

Chao Zhang, Xiaomiao Mu, Ruoyu Sun, Songjing Li, Zhao Wang, Xinguang Li, Muhammad Asif Sherliyat, Xiaojian Wang, Yi Liu, Wang Zheng, and Jiubin Chen

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Short summary
This study investigates long-term (2018–2025) atmospheric mercury trends in Tianjin, China. Gaseous mercury concentrations declined by > 60 % and stabilized near background levels during and after the COVID-19 pandemic. Mercury isotopes reveal a shift from local emission dominance to background influence, with secondary re-emission from urban surfaces becoming increasingly important. The results demonstrate effective emission controls and the rising significance of legacy mercury in cities.
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