Aerosol Research
Aerosol Research
Aerosol Research
Articles | Volume 3, issue 1
Articles | Volume 3, issue 1
https://doi.org/10.5194/ar-3-337-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ar-3-337-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 3, issue 1
Research article
 | 
16 Jun 2025
Research article |  | 16 Jun 2025

Reactive oxygen species buildup in photochemically aged iron- and copper-doped secondary organic aerosol proxy

Kevin Kilchhofer, Alexandre Barth, Battist Utinger, Markus Kalberer, and Markus Ammann

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Latest update: 27 Oct 2025
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Short summary
We report a substantial buildup of reactive molecules (due to sunlight) in organic particulate matter, causing adverse health effects. Metals, which occur naturally or are emitted by traffic, can complex with organic materials and initiate photochemical processes. At low humidity, organic particles may become highly viscous, which allows for the accumulation of reactive species. We found that copper acts as an reducing species to remove some of these harmful species from particles.
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