Risk assessment of airborne transmission of COVID-19 by asymptomatic individuals under different practical settings

被引：160
作者：
Shao, Siyao [1 ,2 ]
Zhou, Dezhi [1 ]
He, Ruichen [1 ,2 ]
Li, Jiaqi [1 ,2 ]
Zou, Shufan [1 ]
Mallery, Kevin [1 ,2 ]
Kumar, Santosh [1 ,2 ]
Yang, Suo [1 ]
Hong, Jiarong [1 ,2 ]
机构：
[1] Univ Minnesota, Dept Mech Engn, 111 Church St SE, Minneapolis, MN 55414 USA
[2] Univ Minnesota, St Anthony Falls Lab, 2 3rd AVE SE, Minneapolis, MN 55414 USA
来源：
JOURNAL OF AEROSOL SCIENCE | 2021年 / 151卷 / 151期
基金：
美国国家卫生研究院;
关键词：
Airborne transmission; Exhaled particles; Digital inline holography; Particle contamination; Ventilation;
D O I：
10.1016/j.jaerosci.2020.105661
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The lack of quantitative risk assessment of airborne transmission of COVID-19 under practical settings leads to large uncertainties and inconsistencies in our preventive measures. Combining in situ measurements and computational fluid dynamics simulations, we quantify the exhaled par-ticles from normal respiratory behaviors and their transport under elevator, small classroom, and supermarket settings to evaluate the risk of inhaling potentially virus-containing particles. Our results show that the design of ventilation is critical for reducing the risk of particle encounters. Inappropriate design can significantly limit the efficiency of particle removal, create local hot spots with orders of magnitude higher risks, and enhance particle deposition causing surface contamination. Additionally, our measurements reveal the presence of a substantial fraction of faceted particles from normal breathing and its strong correlation with breathing depth.
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页数：9
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