Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 16
Articles | Volume 26, issue 16
https://doi.org/10.5194/acp-26-12049-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-12049-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 16
Research article
 | 
25 Aug 2026
Research article |  | 25 Aug 2026

Do GEMS geostationary satellite observations of tropospheric NO2 always improve NOx emission estimates and related air quality modelling?

Fei Yao, Paul I. Palmer, Xiaolin Wang, Yi Wang, Gitaek T. Lee, Haolin Wang, Liang Feng, Daven K. Henze, and Rokjin J. Park

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Short summary
The Geostationary Environment Monitoring Spectrometer (GEMS) provides hourly measurements of tropospheric NO2 during sunlight hours. We assess the added value of GEMS geostationary satellite observations of tropospheric NO2 to constrain monthly NOx emissions and subsequent air quality modelling over a full annual cycle across Asia. We observe a clear seasonal divide, with significant benefits outside summer while limited or even detrimental impacts during summer.
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