Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 23
Articles | Volume 25, issue 23
https://doi.org/10.5194/acp-25-18015-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/acp-25-18015-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 23
Measurement report
 | 
09 Dec 2025
Measurement report |  | 09 Dec 2025

Measurement report: Mobile measurements to estimate urban methane emissions in Tokyo

Taku Umezawa, Yukio Terao, Masahito Ueyama, Satoshi Kameyama, Mark Lunt, and James Lawrence France

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Short summary
Effective mitigation actions require accurate understanding of methane emission characteristics in cities. We conducted atmospheric methane and ethane measurements using a vehicle in the world’s largest megacity, Tokyo, to identify locations and types of emissions and to examine preliminary estimates of their magnitudes. Waste sectors and fugitive natural gas emissions were found to be the major urban sources, and our data suggested need of improved accounting of natural gas related emissions.
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