High spatial resolution CO<sub>2</sub> measurement using low-cost commercial sensors in Seoul megacity

Park, JaeYoung; Ahn, Jinho; Kim, Jeongeun; Salehnia, Nasrin

doi:10.5194/amt-19-2163-2026

Articles | Volume 19, issue 6

https://doi.org/10.5194/amt-19-2163-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-19-2163-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 6

Research article

|

30 Mar 2026

Research article |

| 30 Mar 2026

High spatial resolution CO₂ measurement using low-cost commercial sensors in Seoul megacity

JaeYoung Park, Jinho Ahn, Jeongeun Kim, and Nasrin Salehnia

Supplement

https://doi.org/10.5194/amt-19-2163-2026-supplement

Data sets

Supplement for: High spatial resolution CO2 measurement using low-cost commercial sensors in Seoul megacity (preprint) JaeYoung Park https://doi.org/10.5281/zenodo.18812798

Video supplement

Video S1 - Measurement of CO2 concentration at Bongcheon Intersection for 2022 Jun 08 Jaeyoung Park, Jinho Ahn, and Nasrin Salehnia https://doi.org/10.5446/70548

Video S2 - Rate of CO2 concentration change at Bongcheon Intersection for 2022 Jun 08 Jaeyoung Park, Jinho Ahn, and Nasrin Salehnia https://doi.org/10.5446/70549

Video S3 - Measurement of CO2 concentration at Bongcheon Intersection for 2023 Feb 08 Jaeyoung Park, Jinho Ahn, and Nasrin Salehnia https://doi.org/10.5446/70550

Video S4 - Rate of CO2 concentration change at Bongcheon Intersection for 2023 Feb 08 Jaeyoung Park, Jinho Ahn, and Nasrin Salehnia https://doi.org/10.5446/70551

Short summary

This study shows that low-cost CO₂ sensors, when individually corrected using multi-point linear regression, can achieve 1–2 % accuracy. Deployed in Seoul, they revealed local pollution patterns like idling emissions at intersections and the "piston effect" in tunnels. With proper correction, these sensors enable affordable, detailed urban CO₂ monitoring.