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

• Published in: Geophysical research letters 2020-12, Vol.47 (23), p.e2020GL090444-n/a
• Main Authors: Xu, Liang, Zhang, Jian, Sun, Xin, Xu, Shengchen, Shan, Meng, Yuan, Qi, Liu, Lei, Du, Zhenhong, Liu, Dantong, Xu, Da, Song, Congbo, Liu, Bowen, Lu, Gongda, Shi, Zongbo, Li, Weijun
• Format: Article
• Language: English
• Subjects: Aerosols; Aerosols and Particles; Atmospheric Composition and Structure; black carbon; COVID‐19 lockdown; Oceanography: Biological and Chemical; Paleoceanography; Pollution: Urban and Regional; Research Letter; Research Letters; source; The COVID‐19 Pandemic: Linking Health, Society and Environment
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1029/2020GL090444

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. Key Points BC concentrations during the COVID‐lockdown were reduced by 44% in a megacity of China BC from fossil fuels has the largest reduction in urban area during the COVID‐lockdown Vehicles and industrial activities are the major contributors of BC in the megacity, followed by and biomass burning