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Preprints
https://doi.org/10.5194/egusphere-2023-2913
https://doi.org/10.5194/egusphere-2023-2913
12 Feb 2024
 | 12 Feb 2024

Measurement Report: Elevated excess-NH3 can promote the redox reaction to produce HONO: Insights from the COVID-19 pandemic

Xinyuan Zhang, Lingling Wang, Nan Wang, Shuangliang Ma, Shenbo Wang, Ruiqin Zhang, Dong Zhang, Mingkai Wang, and Hongyu Zhang

Abstract. The incongruity between atmospheric oxidizing capacity and NOx emissions during the COVID-19 pandemic remains puzzling. Here, we show evidence from field observations of ten sites in China that there was a noticeable increase in NH3 concentrations during the COVID-19 pandemic. In addition to the meteorological conditions, the significant decrease in sulfate and nitrate concentrations enhanced the portioning of NH4+ to NH3 Such conditions enable enhanced particle pH values, which in turn accelerate the redox reactions between NO2 and SO2 to form HONO. This mechanism partly explains the enhanced atmospheric oxidizing capacity during the pandemic and highlights the importance of coordinating the control of SO2, NOx, and NH3 emissions.

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Journal article(s) based on this preprint

06 Sep 2024
Measurement report: Elevated atmospheric ammonia may promote particle pH and HONO formation – insights from the COVID-19 pandemic
Xinyuan Zhang, Lingling Wang, Nan Wang, Shuangliang Ma, Shenbo Wang, Ruiqin Zhang, Dong Zhang, Mingkai Wang, and Hongyu Zhang
Atmos. Chem. Phys., 24, 9885–9898, https://doi.org/10.5194/acp-24-9885-2024,https://doi.org/10.5194/acp-24-9885-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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Online observational data on particulate matter composition, gaseous pollutants, and...
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