Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 7
Articles | Volume 19, issue 7
https://doi.org/10.5194/amt-19-2369-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/amt-19-2369-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 7
Research article
 | 
10 Apr 2026
Research article |  | 10 Apr 2026

Simultaneous measurements of near-surface CO2 and NO2 to monitor the fossil-fuel combustion-derived CO2 in the Greater Tokyo Area

Hitoshi Irie, Masataka Nomoto, Yoshikazu Kamiya, and Yukio Terao

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Short summary
Continuous year-round measurements in Chiba, Japan, combining in‑situ CO2 observations with MAX‑DOAS (Multi-Axis Differential Optical Absorption Spectroscopy) NO2, showed that CO2 levels decrease on days with low near-surface NO2. CO2 enhancements quantified using these low-NO2 days correlated strongly with NO₂ and black carbon, indicating that this metric effectively tracks fossil-fuel-derived CO₂. The approach offers a simple, accurate method for monitoring urban CO2 emissions in megacities.
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