Author
Mengyuan Zhang
Bio: Mengyuan Zhang is an academic researcher from Fudan University. The author has contributed to research in topics: Environmental science & Beijing. The author has an hindex of 3, co-authored 4 publications receiving 567 citations.
Papers
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TL;DR: Confidence is given to the regulatory bodies that even during unfavourable meteorology, a significant improvement in air quality could be expected if strict execution of air quality control plans is implemented.
834 citations
TL;DR: In this article, the authors used the Community Multi-Scale Air Quality (CMAQ) model to estimate the changes of key air pollutants and found that during lockdown periods, significant reductions of PM 2.5 concentration and its major components were predicted, especially for secondary inorganic aerosols that are up to 92, 57, and 79% for nitrate (NO 3 - ), sulfate (SO 4 2 - ), and ammonium(NH 4 + ), respectively.
Abstract: . To mitigate the impacts of the pandemic of coronavirus disease 2019 (COVID-19), the Indian government implemented lockdown measures on 24 March 2020, which prohibited unnecessary anthropogenic activities, thus leading to a significant reduction in emissions. To investigate the impacts of this lockdown measure on air quality in India, we used the Community Multi-Scale Air Quality (CMAQ) model to estimate the changes of key air pollutants. From pre-lockdown to lockdown periods, improved air quality is observed in India, indicated by the lower key pollutant levels such as PM 2.5 ( − 26 %), maximum daily 8 h average ozone (MDA8 O 3 ) ( − 11 %), NO 2 ( − 50 %), and SO 2 ( − 14 %). In addition, changes in these pollutants show distinct spatial variations with the more important decrease in northern and western India. During the lockdown, our results illustrate that such emission reductions play a positive role in the improvement of air quality. Significant reductions of PM 2.5 concentration and its major components are predicted, especially for secondary inorganic aerosols that are up to 92 %, 57 %, and
79 % for nitrate (NO 3 - ), sulfate (SO 4 2 - ), and ammonium
(NH 4 + ), respectively. On average, the MDA8 O 3 also decreases
15 % during the lockdown period although it increases slightly in some VOC-limited urban locations, which is mainly due to the more significant reduction of NO x than VOCs. More aggressive and localized emission control strategies should be implemented in India to mitigate air pollution in the future.
33 citations
TL;DR: A review of the published literature on airborne microplastics can be found in this article , which gives an overview of the advantages and disadvantages of current airborne MPs collection techniques, extraction methods and identification (i.e., passive sampling, density separation and visual identification).
25 citations
TL;DR: In this paper , current understandings on the physical and chemical characteristics, mixing state and heterogeneous chemical reactions of individual aerosol particles, mainly obtained with electron microscopes, are reviewed.
16 citations
TL;DR: How the uncertainties in open burning emissions will influence PM2.5 simulation, on not only primary components but also secondary species is illustrated.
11 citations
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TL;DR: The study is thought to be a useful supplement to the regulatory bodies since it showed the pollution source control can attenuate the air quality.
814 citations
TL;DR: Overall, existing knowledge shows that the COVID-19 crisis entails an excellent opportunity for planners and policy makers to take transformative actions towards creating cities that are more just, resilient, and sustainable.
610 citations
TL;DR: Although the partial lockdown has contributed to a positive impact on air quality, it is important to take into account the negative impacts on social aspects, considering the deaths caused by COVID-19 and also the dramatic economic effects.
502 citations
TL;DR: A small increase in air pollution leads to a large increase in the COVID-19 infectivity and mortality rate in England, and this study provides a framework to guide both health and emissions policies in countries affected by this pandemic.
350 citations
TL;DR: These results allow us to see the limits that can be achieved by implementing low emission zones (LEZ), as well as the amount of contamination that must be eliminated, which in the cases of Madrid and Barcelona, represent 55%.
321 citations