Title:
Face shields, masks with valves ineffective against COVID-19 spread: study
Source:
Florida Atlantic University
Published:
Phys.org, 1 September 2020
https://phys.org/news/2020-09-shields-masks-valves-ineffective-covid-.html
From the article:
To increase public awareness about the effectiveness of face shields alone as well as face masks with exhalation valves, researchers from Florida Atlantic University's College of Engineering and Computer Science used qualitative visualizations to test how face shields and masks with valves perform in impeding the spread of aerosol-sized droplets. Widespread public use of these alternatives to regular masks could potentially have an adverse effect on mitigation efforts.