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-26-11817-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-11817-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 16
Research article
 | 
20 Aug 2026
Research article |  | 20 Aug 2026

New insights into traffic emissions: the role of hydrocarbons and oxygenated organic species in traffic-derived aerosol

Sanna Saarikoski, Minna Aurela, Jarkko V. Niemi, Luis M. F. Barreira, Jussi Hoivala, Hanna Manninen, Topi Rönkkö, and Hilkka Timonen

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Short summary
This study analyzed submicron organic aerosol (OA) at a Helsinki traffic site (2018–2024) using aerosol mass spectrometer. Findings show that traffic OA includes both hydrocarbons (HOA) and oxygenated traffic-related OA (TrOA). TrOA peaks later in morning than HOA, likely due to atmospheric processing or modern vehicle emissions. Using only HOA to estimate traffic primary OA may cause a 50 % underestimation indicating that traffic OA is complicated, involving both primary and secondary aerosols.
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