Currently, there are no specific guidelines on the most effective materials and designs for facemasks to minimize the spread of droplets from coughs or sneezes to mitigate the transmission of COVID-19. While there have been prior studies on how medical-grade masks perform, data on cloth-based coverings used by the vast majority of the general public are sparse.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/2VrQxFl
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