Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 20
Articles | Volume 26, issue 20
https://doi.org/10.5194/acp-26-14823-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-14823-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 20
Research article
 | 
22 Oct 2026
Research article |  | 22 Oct 2026

From direct emission factors to inverse and indirect impact factors of road traffic: influence of emerging and unregulated pollutants

Lauri K. Savolainen, Teemu Lepistö, Heidi Hellén, Henna Lintusaari, Milja Jäppi, Jarkko V. Niemi, Kimmo Teinilä, Minna Aurela, Markus Lampimäki, Anu Kousa, Janne Lampilahti, Katrianne Lehtipalo, Tuukka Petäjä, Miikka Dal Maso, Hanna E. Manninen, Hilkka Timonen, and Topi Rönkkö

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Short summary
The study investigates vehicle fleet emissions of road traffic. Despite technological advances, road traffic is still an important pollution source in urban areas, especially when considering unregulated, but health-relevant, emerging pollutants. We report fuel consumption normalized vehicle fleet emission factors for various regulated and unregulated air pollutants. Also, we show that road traffic has inverse and indirect effects on urban aerosol which are not generally well understood.
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