Aerosol Research
Aerosol Research
Aerosol Research
Articles | Volume 3, issue 2
Articles | Volume 3, issue 2
https://doi.org/10.5194/ar-3-521-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ar-3-521-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 3, issue 2
Research article
 | 
18 Nov 2025
Research article |  | 18 Nov 2025

Condensation diffusion charging – particle number measurement of high concentrations down to 3 nm

Helmut Krasa, Victoria M. Fruhmann, Sebastian Schurl, Martin Kupper, and Alexander Bergmann

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Latest update: 21 Aug 2026
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Short summary
This study presents a new method to measure ultrafine airborne particle concentrations down to 3 nm at high concentrations. By growing the particles into droplets, subsequently electrically charging them, and detecting the electrical signal, the system enables accurate and compact measurements of the particle number concentration. This approach is useful for onboard monitoring of vehicle emissions where space is limited and high concentrations are measured.
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