Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 15
Articles | Volume 26, issue 15
https://doi.org/10.5194/acp-26-11047-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-11047-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 15
Research article
 | 
07 Aug 2026
Research article |  | 07 Aug 2026

Characterizing emissions, chemistry, and health impacts of aged wildfire smoke in a western US city

Lixu Jin, Lu Tan, Damien T. Ketcherside, Vanessa Selimovic, Keri Nauman, Robert J. Yokelson, and Lu Hu

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Short summary
We measured air pollution hour by hour in a United States city during a wildfire-smoke episode in 2020 and compared it with a computer air-quality model. Ozone increased in light smoke but leveled off or declined in heavy smoke, a pattern the model missed. The model also underestimated smoke pollution and the resulting cancer and short-term health risks, showing that better representations of wildfire emissions and smoke chemistry are needed for reliable forecasts and risk assessment.
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