Measurement Report: Elevated excess-NH 3 can promote the redox reaction to produce HONO: Insights from the COVID-19 pandemic

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

The incongruity between atmospheric oxidizing capacity and NO x 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 NH 3 concentrations during the COVID-19 pandemic. In addition to the meteorological conditions, the significant decrease in sulfate and nitrate concentrations enhanced the portioning of NH 4+ to NH 3 Such conditions enable enhanced particle pH values, which in turn accelerate the redox reactions between NO 2 and SO 2 to form HONO. This mechanism partly explains the enhanced atmospheric oxidizing capacity during the pandemic and highlights the importance of coordinating the control of SO 2, NO x, and NH 3 emissions.

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Zhang, Xinyuan / Wang, Lingling / Wang, Nan / et al: Measurement Report: Elevated excess-NH3 can promote the redox reaction to produce HONO: Insights from the COVID-19 pandemic. 2024. Copernicus Publications.

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