Variation in Concentration and Sources of Black Carbon in a Megacity of China During the COVID-19 Pandemic

Liang Xu, Jian Zhang, Xin Sun, Shengchen Xu, Meng Shan, Qi Yuan, Lei Liu, Zhenhong Du, Dantong Liu, Da Xu, Congbo Song, Bowen Liu, Gongda Lu, Zongbo Shi, Weijun Li

Research output: Contribution to journalArticlepeer-review

Abstract

Black carbon (BC) not only warms the atmosphere but also affects human health. The nationwide lockdown due to the Coronavirus Disease 2019 (COVID-19) pandemic led to a major reduction in human activity during the past 30 years. Here, the concentration of BC in the urban, urban-industry, suburb, and rural areas of a megacity Hangzhou were monitored using a multiwavelength Aethalometer to estimate the impact of the COVID-19 lockdown on BC emissions. The citywide BC decreased by 44% from 2.30 to 1.29 μg/m3 following the COVID-19 lockdown period. The source apportionment based on the Aethalometer model shows that vehicle emission reduction responded to BC decline in the urban area and biomass burning in rural areas around the megacity had a regional contribution of BC. We highlight that the emission controls of vehicles in urban areas and biomass burning in rural areas should be more efficient in reducing BC in the megacity Hangzhou.

Original languageEnglish
Article numbere2020GL090444
JournalGeophysical Research Letters
Volume47
Issue number23
DOIs
Publication statusPublished - 16 Dec 2020

Keywords

  • black carbon
  • COVID-19 lockdown
  • source

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