Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 18
Articles | Volume 26, issue 18
https://doi.org/10.5194/acp-26-13485-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-13485-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 18
Research article
 | 
25 Sep 2026
Research article |  | 25 Sep 2026

Climate impact of contrail cirrus from hydrogen combustion aircraft

Susanne M. Pettersson, Christian Azar, and Daniel J. A. Johansson

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Short summary
Hydrogen-combustion aircraft could reduce aviation’s climate impact by eliminating carbon dioxide emissions and, in most cases, forming less warming cloud cover than jet-fuel aircraft. We used climate and aircraft modelling to study how these clouds form when soot is replaced by other particles, especially lubrication oil. The results suggest that hydrogen aircraft could be cleaner, but this depends partly on engine designs that limit lubrication oil emissions.
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