期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 17, 页码 11557-11567出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c03421
关键词
COVID-19; atmospheric odd oxygen; ozone; VOCs; secondary aerosol
资金
- National Natural Science Foundation of China [91744202]
- Ministry of Science and Technology of China [2017YFC0210004]
The COVID-19 lockdown led to reductions in secondary aerosol components in eastern China due to decreases in precursor emissions, but insufficient VOC reduction limited further decreases in aerosols; areas with decreased Ox during the lockdown experienced greater PM2.5 decreases, indicating the importance of VOC control in future policies to mitigate winter haze more efficiently.
The lockdown due to COVID-19 created a rare opportunity to examine the nonlinear responses of secondary aerosols, which are formed through atmospheric oxidation of gaseous precursors, to intensive precursor emission reductions. Based on unique observational data sets from six supersites in eastern China during 2019-2021, we found that the lockdown caused considerable decreases (32-61%) in different secondary aerosol components in the study region because of similar-degree precursor reductions. However, due to insufficient combustionrelated volatile organic compound (VOC) reduction, odd oxygen (O-x = O-3 + NO2) concentration, an indicator of the extent of photochemical processing, showed little change and did not promote more decreases in secondary aerosols. We also found that the Chinese provinces and international cities that experienced reduced Ox during the lockdown usually gained a greater simultaneous PM2.5 decrease than other provinces and cities with an increased Ox. Therefore, we argue that strict VOC control in winter, which has been largely ignored so far, is critical in future policies to mitigate winter haze more efficiently by reducing Ox simultaneously.
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