Chemistry of atmospheric fine particles during the COVID-19 pandemic in a megacity of eastern China

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Chemistry of atmospheric fine particles during the COVID-19 pandemic in a megacity of eastern China. / Liu, Lei; Zhang, Jian; Du, Rongguang; Teng, Xiaomi; Hu, Rui; Yuan, Qi; Tang, Shanshan; Ren, Chuanhua; Huang, Xin; Xu, Liang; Zhang, Yinxiao; Zhang, Xiaoye; Song, Congbo; Liu, Bowen; Lu, Gongda; Shi, Zongbo; Li, Weijun.

In: Geophysical Research Letters, Vol. 48, No. 2, 2020GL091611, 28.01.2021.

Research output: Contribution to journalLetterpeer-review

Harvard

Liu, L, Zhang, J, Du, R, Teng, X, Hu, R, Yuan, Q, Tang, S, Ren, C, Huang, X, Xu, L, Zhang, Y, Zhang, X, Song, C, Liu, B, Lu, G, Shi, Z & Li, W 2021, 'Chemistry of atmospheric fine particles during the COVID-19 pandemic in a megacity of eastern China', Geophysical Research Letters, vol. 48, no. 2, 2020GL091611. https://doi.org/10.1029/2020GL091611

APA

Liu, L., Zhang, J., Du, R., Teng, X., Hu, R., Yuan, Q., Tang, S., Ren, C., Huang, X., Xu, L., Zhang, Y., Zhang, X., Song, C., Liu, B., Lu, G., Shi, Z., & Li, W. (2021). Chemistry of atmospheric fine particles during the COVID-19 pandemic in a megacity of eastern China. Geophysical Research Letters, 48(2), [2020GL091611]. https://doi.org/10.1029/2020GL091611

Vancouver

Author

Liu, Lei ; Zhang, Jian ; Du, Rongguang ; Teng, Xiaomi ; Hu, Rui ; Yuan, Qi ; Tang, Shanshan ; Ren, Chuanhua ; Huang, Xin ; Xu, Liang ; Zhang, Yinxiao ; Zhang, Xiaoye ; Song, Congbo ; Liu, Bowen ; Lu, Gongda ; Shi, Zongbo ; Li, Weijun. / Chemistry of atmospheric fine particles during the COVID-19 pandemic in a megacity of eastern China. In: Geophysical Research Letters. 2021 ; Vol. 48, No. 2.

Bibtex

@article{7769f7ee28284eacb9bdff31c0fdaa7f,
title = "Chemistry of atmospheric fine particles during the COVID-19 pandemic in a megacity of eastern China",
abstract = "Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NOx decrease (77%) led to significant O3 increases (a factor of 2) during the COVID-19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO2 radicals and nighttime NO3 radical, which can promote the gas-phase reaction and nocturnal multiphase chemistry. Therefore, enhanced NO3− and SO42− formation was observed during the COVID-19 lockdown because of the enhanced oxidizing capacity. The PM2.5 decrease was only partially offset by enhanced aerosol formation with its reduction reaching 50%. In particular, NO3− decreased largely by 68%. PM2.5 chemical analysis reveals that vehicular emissions mainly contributed to PM2.5 under normal conditions in Hangzhou. Whereas, stationary sources dominated the residual PM2.5 during the COVID-19 lockdown. This study provides evidence that large reductions in vehicular emissions can effectively mitigate air pollution in megacities.",
keywords = "air pollution, chemical composition, COVID-19, fine particles, megacity",
author = "Lei Liu and Jian Zhang and Rongguang Du and Xiaomi Teng and Rui Hu and Qi Yuan and Shanshan Tang and Chuanhua Ren and Xin Huang and Liang Xu and Yinxiao Zhang and Xiaoye Zhang and Congbo Song and Bowen Liu and Gongda Lu and Zongbo Shi and Weijun Li",
note = "Funding Information: This work was funded by the National Natural Science Foundation of China (42075096 and 91844301), the National Key R&D Program of China (2017YFC0212700), Zhejiang Provincial Natural Science Foundation of China (LZ19D050001), Zhejiang Meteorological Science and Technology Program (2019YB11), LAC/CMA (2020B02), and China Postdoctoral Science Foundation (2020M681823). Gongda Lu thanks the PhD studentship funded by China Scholarship Council. Publisher Copyright: {\textcopyright} 2020. The Authors.",
year = "2021",
month = jan,
day = "28",
doi = "10.1029/2020GL091611",
language = "English",
volume = "48",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "2",

}

RIS

TY - JOUR

T1 - Chemistry of atmospheric fine particles during the COVID-19 pandemic in a megacity of eastern China

AU - Liu, Lei

AU - Zhang, Jian

AU - Du, Rongguang

AU - Teng, Xiaomi

AU - Hu, Rui

AU - Yuan, Qi

AU - Tang, Shanshan

AU - Ren, Chuanhua

AU - Huang, Xin

AU - Xu, Liang

AU - Zhang, Yinxiao

AU - Zhang, Xiaoye

AU - Song, Congbo

AU - Liu, Bowen

AU - Lu, Gongda

AU - Shi, Zongbo

AU - Li, Weijun

N1 - Funding Information: This work was funded by the National Natural Science Foundation of China (42075096 and 91844301), the National Key R&D Program of China (2017YFC0212700), Zhejiang Provincial Natural Science Foundation of China (LZ19D050001), Zhejiang Meteorological Science and Technology Program (2019YB11), LAC/CMA (2020B02), and China Postdoctoral Science Foundation (2020M681823). Gongda Lu thanks the PhD studentship funded by China Scholarship Council. Publisher Copyright: © 2020. The Authors.

PY - 2021/1/28

Y1 - 2021/1/28

N2 - Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NOx decrease (77%) led to significant O3 increases (a factor of 2) during the COVID-19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO2 radicals and nighttime NO3 radical, which can promote the gas-phase reaction and nocturnal multiphase chemistry. Therefore, enhanced NO3− and SO42− formation was observed during the COVID-19 lockdown because of the enhanced oxidizing capacity. The PM2.5 decrease was only partially offset by enhanced aerosol formation with its reduction reaching 50%. In particular, NO3− decreased largely by 68%. PM2.5 chemical analysis reveals that vehicular emissions mainly contributed to PM2.5 under normal conditions in Hangzhou. Whereas, stationary sources dominated the residual PM2.5 during the COVID-19 lockdown. This study provides evidence that large reductions in vehicular emissions can effectively mitigate air pollution in megacities.

AB - Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NOx decrease (77%) led to significant O3 increases (a factor of 2) during the COVID-19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO2 radicals and nighttime NO3 radical, which can promote the gas-phase reaction and nocturnal multiphase chemistry. Therefore, enhanced NO3− and SO42− formation was observed during the COVID-19 lockdown because of the enhanced oxidizing capacity. The PM2.5 decrease was only partially offset by enhanced aerosol formation with its reduction reaching 50%. In particular, NO3− decreased largely by 68%. PM2.5 chemical analysis reveals that vehicular emissions mainly contributed to PM2.5 under normal conditions in Hangzhou. Whereas, stationary sources dominated the residual PM2.5 during the COVID-19 lockdown. This study provides evidence that large reductions in vehicular emissions can effectively mitigate air pollution in megacities.

KW - air pollution

KW - chemical composition

KW - COVID-19

KW - fine particles

KW - megacity

UR - http://www.scopus.com/inward/record.url?scp=85099757190&partnerID=8YFLogxK

U2 - 10.1029/2020GL091611

DO - 10.1029/2020GL091611

M3 - Letter

AN - SCOPUS:85099757190

VL - 48

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 2

M1 - 2020GL091611

ER -