Articles | Volume 22, issue 8
https://doi.org/10.5194/acp-22-5099-2022
https://doi.org/10.5194/acp-22-5099-2022
Research article
 | 
19 Apr 2022
Research article |  | 19 Apr 2022

Oxidation pathways and emission sources of atmospheric particulate nitrate in Seoul: based on δ15N and Δ17O measurements

Saehee Lim, Meehye Lee, Joel Savarino, and Paolo Laj

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Cited articles

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We determined δ15N(NO3) and Δ17O(NO3) of PM2.5 in Seoul during 2018–2019 and estimated quantitatively the contribution of oxidation pathways to NO3 formation and NOx emission sources. The nighttime pathway played a significant role in NO3 formation during the winter, and its contribution further increased up to 70 % on haze days when PM2.5 was greater than 75 µg m−3. Vehicle emissions were confirmed as a main NO3 source with an increasing contribution from coal combustion in winter.
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