Increasing contribution of nighttime nitrogen chemistry to wintertime haze formation in Beijing observed during COVID-19 lockdowns - Nature Geoscience

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By Yee Jun Tham, Wei Nie, Haichao Wang, Wei Ma, Junlei Zhan, Yiran Li, Qinyi Li, Anoop S. Mahajan, Carlos Cuevas, Zhe Wang, Yele Sun, Alfonso Saiz-Lopez, Federico Bianchi , Veli-Matti Kerminen, Neil M. Donahue, Yongchun Liu, Aijun DING, Men Xia, Douglas R. Worsnop
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Abstract Nitrate comprises the largest fraction of fine particulate matter in China during severe haze. Consequently, strict control of nitrogen oxides (NOx) emissions has been regarded as an effective measure to combat air pollution. However, this notion is challenged by the persistent severe haze pollution observed during the COVID-19 lockdown when NOx levels substantially declined.
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