Articles | Volume 20, issue 1
Atmos. Chem. Phys., 20, 1–13, 2020
Atmos. Chem. Phys., 20, 1–13, 2020

Research article 02 Jan 2020

Research article | 02 Jan 2020

Traffic-originated nanocluster emission exceeds H2SO4-driven photochemical new particle formation in an urban area

Miska Olin et al.

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Short summary
Photochemically formed sulfuric acid is generally considered the main source for new particle formation in the atmosphere. Contrary to current understanding, our measurements of nanoclusters and gaseous sulfuric acid performed in an urban area imply that traffic contributes to sulfuric acid concentration and that even for the smallest particles, the traffic-emitted fraction mostly exceeds the photochemistry-driven regional new particle formation.
Final-revised paper