NOx emissions constraints from GEMS NO2 retrievals: inversion methodology and air quality model evaluation in Bangkok using ASIA-AQ multi-platform observations

Christopoulos, Julianna A.; Saide, Pablo E.; Mohanty, Manas R.; Maneenoi, Nattamon; Kim, Jhoon; Judd, Laura; Travis, Katherine R.; Garivait, Savitri; Junpen, Agapol; Miyazaki, Kazuyuki; Choi, Jinkyul; Sekiya, Takashi; Peterson, David; McHardy, Theodore M.; Gapp, Nicholas; St. Clair, Jason M.; Delaria, Erin; Wolfe, Glenn M.; Sebol, Abby; Franchin, Alessandro; Cho, Changmin; Silverman, Morgan L.; Crawford, James H.

doi:10.5194/acp-26-8021-2026

Articles | Volume 26, issue 11

https://doi.org/10.5194/acp-26-8021-2026

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

https://doi.org/10.5194/acp-26-8021-2026

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

Articles | Volume 26, issue 11

Research article

|

11 Jun 2026

Research article |

| 11 Jun 2026

NO_x emissions constraints from GEMS NO₂ retrievals: inversion methodology and air quality model evaluation in Bangkok using ASIA-AQ multi-platform observations

Julianna A. Christopoulos, Pablo E. Saide, Manas R. Mohanty, Nattamon Maneenoi, Jhoon Kim, Laura Judd, Katherine R. Travis, Savitri Garivait, Agapol Junpen, Kazuyuki Miyazaki, Jinkyul Choi, Takashi Sekiya, David Peterson, Theodore M. McHardy, Nicholas Gapp, Jason M. St. Clair, Erin Delaria, Glenn M. Wolfe, Abby Sebol, Alessandro Franchin, Changmin Cho, Morgan L. Silverman, and James H. Crawford

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Final revised paper (published on 11 Jun 2026)
Supplement to the final revised paper
Preprint (discussion started on 10 Feb 2026)
Supplement to the preprint

Interactive discussion

Status: closed

RC1:
'Comment on egusphere-2026-472', Anonymous Referee #1, 09 Mar 2026

The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2026/egusphere-2026-472/egusphere-2026-472-RC1-supplement.pdf

Citation: https://doi.org/10.5194/egusphere-2026-472-RC1
- AC1: 'Reply on RC1', Julianna Christopoulos, 01 May 2026
  
  The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2026/egusphere-2026-472/egusphere-2026-472-AC1-supplement.pdf
  
  Citation: https://doi.org/10.5194/egusphere-2026-472-AC1
RC2:
'Comment on egusphere-2026-472', Anonymous Referee #2, 30 Mar 2026

The comments are attached in the Supplement.

Citation: https://doi.org/10.5194/egusphere-2026-472-RC2
- AC2: 'Reply on RC2', Julianna Christopoulos, 01 May 2026
  
  The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2026/egusphere-2026-472/egusphere-2026-472-AC2-supplement.pdf
  
  Citation: https://doi.org/10.5194/egusphere-2026-472-AC2

Peer review completion

AR – Author's response | RR – Referee report | ED – Editor decision | EF – Editorial file upload

AR by Julianna Christopoulos on behalf of the Authors (02 May 2026) Author's response Author's tracked changes Manuscript

ED: Publish subject to minor revisions (review by editor) (06 May 2026) by Andreas Hofzumahaus

AR by Julianna Christopoulos on behalf of the Authors (06 May 2026) Author's response Author's tracked changes Manuscript

ED: Publish as is (08 May 2026) by Andreas Hofzumahaus

AR by Julianna Christopoulos on behalf of the Authors (12 May 2026) Manuscript

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Short summary

Air quality in rapidly growing cities is difficult to model because emissions vary during the day and are often poorly constrained. We demonstrate a methodology for constraining urban emissions using hourly satellite observations combined with high-resolution air quality modeling in Bangkok. We find that emissions inventories likely overestimate nitrogen dioxide emissions, and that updated emissions improve agreement between the model and independent aircraft and ground-based observations.