Technical note: Apportionment of Southeast Asian biomass burning and urban influence via in situ  trace gas enhancement ratios

DiGangi, Joshua P.; Diskin, Glenn S.; Yoon, Subin; Alvarez, Sergio L.; Flynn, James H.; Robinson, Claire E.; Shook, Michael A.; Thornhill, K. Lee; Winstead, Edward L.; Ziemba, Luke D.; Cambaliza, Maria Obiminda L.; Simpas, James B.; Hilario, Miguel Ricardo A.; Sorooshian, Armin

doi:10.5194/acp-25-17387-2025

Articles | Volume 25, issue 23

https://doi.org/10.5194/acp-25-17387-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-17387-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 23

Technical note

|

02 Dec 2025

Technical note |

| 02 Dec 2025

Technical note: Apportionment of Southeast Asian biomass burning and urban influence via in situ trace gas enhancement ratios

Joshua P. DiGangi, Glenn S. Diskin, Subin Yoon, Sergio L. Alvarez, James H. Flynn, Claire E. Robinson, Michael A. Shook, K. Lee Thornhill, Edward L. Winstead, Luke D. Ziemba, Maria Obiminda L. Cambaliza, James B. Simpas, Miguel Ricardo A. Hilario, and Armin Sorooshian

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May 2025	172	36	12	220
Jun 2025	132	14	14	160
Jul 2025	70	38	4	112
Aug 2025	2,212	26	14	2,252
Sep 2025	7,282	24	8	7,314
Oct 2025	262	22	6	290
Nov 2025	110	38	10	158
Dec 2025	395	107	21	523
Jan 2026	192	106	23	321
Feb 2026	184	71	20	275
Mar 2026	123	82	14	219
Apr 2026	151	51	13	215
May 2026	108	21	8	137
Jun 2026	24	6	6	36

Cumulative views and downloads (calculated since 14 May 2025)

Month	HTML	PDF	XML	Total
May 2025	172	36	12	220
Jun 2025	132	14	14	160
Jul 2025	70	38	4	112
Aug 2025	2,212	26	14	2,252
Sep 2025	7,282	24	8	7,314
Oct 2025	262	22	6	290
Nov 2025	110	38	10	158
Dec 2025	395	107	21	523
Jan 2026	192	106	23	321
Feb 2026	184	71	20	275
Mar 2026	123	82	14	219
Apr 2026	151	51	13	215
May 2026	108	21	8	137
Jun 2026	24	6	6	36

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Short summary

Both fire and urban emissions are major contributors to air pollution in Southeast Asia. Relative increases in measurements of methane and carbon monoxide gases during an aircraft campaign near the Philippines in 2019 were used to isolate pollution emissions from fires vs. urban sources. Results were compared to atmospheric transport models to determine the sources' regional origins, and relationships between pollution indicators relevant to poor air quality were investigated for each source.