Opposite Impact of Emission Reduction During the COVID-19 Lockdown Period on the Surface Concentrations of PM and O in Wuhan, China

Overview

Journal Environ Pollut

Specialty Environmental Health

Date 2021 Aug 6

PMID 34358865

Citations 13

Authors

Hao Yin

Cheng Liu

Qihou Hu

Ting Liu

Shuntian Wang

Meng Gao

Shiqi Xu

Chengxin Zhang

Wenjing Su

Affiliations

Soon will be listed here.

Abstract

To prevent the spread of the COVID-19 epidemic, the Chinese megacity Wuhan has taken emergent lockdown measures starting on January 23, 2020. This provided a natural experiment to investigate the response of air quality to such emission reductions. Here, we decoupled the influence of meteorological and non-meteorological factors on main air pollutants using generalized additive models (GAMs), driven by data from the China National Environmental Monitoring Center (CNEMC) network. During the lockdown period (Jan. 23 - Apr. 8, 2020), PM, PM, NO, SO, and CO concentrations decreased significantly by 45 %, 49 %, 56 %, 39 %, and 18 % compared with the corresponding period in 2015-2019, with contributions by S(meteos) of 15 %, 17 %, 13 %, 10 %, and 6 %. This indicates an emission reduction of NO at least 43 %. However, O increased by 43 % with a contribution by S(meteos) of 6 %. In spite of the reduced volatile organic compound (VOC) emissions by 30 % during the strict lockdown period (Jan. 23 - Feb. 14, 2020), which likely reduced the production of O, O concentrations increased due to a weakening of the titration effect of NO. Our results suggest that conventional emission reduction (NO reduction only) measures may not be sufficient to reduce (or even lead to an increase of) surface O concentrations, even if reaching the limit, and VOC-specific measures should also be taken.

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