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-26-5185-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-5185-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 8
Research article
 | 
20 Apr 2026
Research article |  | 20 Apr 2026

Validation of TROPOMI and WRF-Chem NO2 across seasons using SWING+ and surface observations over Bucharest

Antoine Pasternak, Jean-François Müller, Catalina Poraicu, Alexis Merlaud, Frederik Tack, and Trissevgeni Stavrakou

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Short summary
Nitrogen dioxide (NO₂) is a major air pollutant with strong spatial variability near urban sources. We use a regional chemical transport model to simulate NO₂ levels over Bucharest and compare the results with in situ, aircraft, and satellite measurements. We find that emissions of nitrogen oxides are likely underestimated and that the accuracy of the satellite instrument varies with pollution levels. Our results improve the interpretation of satellite data for air quality monitoring.
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