Preprints
https://doi.org/10.5194/egusphere-2022-1412
https://doi.org/10.5194/egusphere-2022-1412
 
02 Jan 2023
02 Jan 2023
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Global impact of COVID-19 lockdown on surface concentration and health risk of atmospheric benzene

Chaohao Ling1,2,, Lulu Cui4,, and Rui Li1,3 Chaohao Ling et al.
  • 1Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai, 200241, PR China
  • 2School of History and Geography, Minnan Normal University, Zhangzhou, 363000, China
  • 3Institute of Eco-Chongming (IEC), 20 Cuiniao Road, Chenjia Town, Chongming District, Shanghai, 202162, China
  • 4State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
  • These authors contributed equally to this work.

Abstract. To curb the spread of COVID-19 pandemic, many countries around the world imposed an unprecedented lockdown producing reductions in pollutant emissions. Unfortunately, the lockdown-driven global ambient benzene changes still remained unknown. The ensemble machine-learning model coupled with the chemical transport models (CTMs) was applied to estimate global high-resolution ambient benzene levels. Afterwards, the XGBoost algorithm was employed to decouple the contributions of meteorology and emission reduction to ambient benzene. The change ratio (Pdew) of deweathered benzene concentration from pre-lockdown to lockdown period was in the order of India (−23.6 %) > Europe (−21.9 %) > United States (−16.2 %) > China (−15.6 %). The detrended change (P*) of deweathered benzene level (change ratio in 2020 – change ratio in 2019) followed the order of India (P* = −16.2 %) > Europe (P* = −13.9 %) > China (P* = −13.3 %) > United States (P* = −6.00 %). Substantial decreases of atmospheric benzene levels saved sufficient health benefits. The global average lifetime carcinogenic risks (LCR) and hazard index (HI) decreased from 4.89 × 10−7 and 5.90 × 10−3 and 4.51 × 10−7 and 5.40 × 10−3, respectively.

Chaohao Ling et al.

Status: open (until 13 Feb 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1412', Anonymous Referee #2, 13 Jan 2023 reply
  • RC2: 'Comment on egusphere-2022-1412', Anonymous Referee #1, 14 Jan 2023 reply

Chaohao Ling et al.

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Short summary
The ensemble machine-learning model coupled with the chemical transport models (CTMs) was applied to assess the impact of COVID-19 on ambient benzene. The change ratio of deweathered benzene concentration from pre-lockdown to lockdown period was in the order of India (−23.6 %) > Europe (−21.9 %) > United States (−16.2 %) > China (−15.6 %), which might be associated with local serious benzene pollution and substantial emission reduction in industry and transportation sectors.