Articles | Volume 26, issue 13
https://doi.org/10.5194/acp-26-9793-2026
https://doi.org/10.5194/acp-26-9793-2026
Research article
 | 
13 Jul 2026
Research article |  | 13 Jul 2026

Chemical characteristics and environmental drivers of nitrogen-containing organic aerosol formation in coastal and inland urban atmospheres in Myanmar

Ning Zhang, Jialiang Feng, Simon Patrick O'Meara, Ziyi Liu, Yingge Ma, Xinlei Ge, Wenjing Li, Piero Chiacchiaretta, Piero Di Carlo, Junfeng Wang, and Eleonora Aruffo

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This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Cited articles

Abudumutailifu, M., Shang, X., Wang, L., Zhang, M., Kang, H., Chen, Y., Li, L., Ju, R., Li, B., Ouyang, H., Tang, X., Li, C., Wang, L., Wang, X., George, C., Rudich, Y., Zhang, R., and Chen, J.: Unveiling the molecular characteristics, origins, and formation mechanism of reduced nitrogen organic compounds in the urban atmosphere of Shanghai using a versatile aerosol concentration enrichment system, Environ. Sci. Technol., 58, 7099–7112, https://doi.org/10.1021/acs.est.3c04071, 2024. 
Amnuaylojaroen, T. and Parasin, N.: Perspective on particulate matter: from biomass burning to the health crisis in mainland Southeast Asia, Toxics, 11, 553, https://doi.org/10.3390/toxics11070553, 2023. 
Andreae, M. O.: Emission of trace gases and aerosols from biomass burning – an updated assessment, Atmos. Chem. Phys., 19, 8523–8546, https://doi.org/10.5194/acp-19-8523-2019, 2019. 
Aruffo, E., Wang, J., Ye, J., Ohno, P., Qin, Y., Stewart, M., McKinney, K., Di Carlo, P., and Martin, S. T.: Partitioning of organonitrates in the production of secondary organic aerosols from α-pinene photo-oxidation, Environ. Sci. Technol., 56, 5421–5429, https://doi.org/10.1021/acs.est.1c08380, 2022. 
Aung, W.-Y., Noguchi, M., Pan-Nu Yi, E.-E., Thant, Z., Uchiyama, S., Win-Shwe, T.-T., Kunugita, N., and Mar, O.: Preliminary assessment of outdoor and indoor air quality in Yangon city, Myanmar, Atmos. Pollut. Res., 10, 722–730, https://doi.org/10.1016/j.apr.2018.11.011, 2019. 
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Short summary
We investigated how nitrogen-containing organic compounds form and evolve in fine particles using field measurements in Myanmar and box-model simulations. We show that relative humidity, photochemistry, and precursor availability jointly control the formation and gas–particle partitioning of light-absorbing nitrophenolic compounds. These findings improve understanding of their impacts on air quality and climate.
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