Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 22
Articles | Volume 25, issue 22
https://doi.org/10.5194/acp-25-17027-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-17027-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 22
Research article
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28 Nov 2025
Research article | Highlight paper |  | 28 Nov 2025

The global importance of gas-phase peroxy radical accretion reactions for secondary organic aerosol loading

Alfred W. Mayhew, Lauri Franzon, Kelvin H. Bates, Theo Kurtén, Felipe D. Lopez-Hilfiker, Claudia Mohr, Andrew R. Rickard, Joel A. Thornton, and Jessica D. Haskins

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This study provides the first global-scale quantification of gas-phase cross-reactions of peroxy radicals (RO₂) as a major source of secondary organic aerosol, revealing that these accretion reactions may account for up to 50% of PM2.5 in tropical regions. Its findings have significant implications for atmospheric chemistry, climate modeling, and air quality assessments, making it of broad interest to the geoscience community.
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This work outlines an investigation into an understudied atmospheric chemical reaction pathway with the potential to form particulate pollution that has important impacts on air quality and climate. It suggests that this chemical pathway is responsible for a large fraction of the atmospheric particulate matter observed in tropical forested regions, but also highlights the need for further ambient and lab investigations to inform an accurate representation of this process in atmospheric models.
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