Airborne Transmission of Coronavirus & Cloth Mask Filtration
Hundreds of experts have been urging the World Health Organization to review mounting scientific research. At last, on Tuesday July 7th, the agency acknowledged that airborne transmission of the coronavirus may be a threat. (https://www.nytimes.com/2020/07/07/health/coronavirus-aerosols-who.html)
This led us to take look for any available data on the capability of Cloth Masks regarding aerosol particulate.
In 2010, a review published in The Annals of Occupational Hygiene compared the Filtration Performance of Cloth Masks and Common Fabric Materials Against 20–1000 nm Size Particles. The conclusion: The use of fabric materials may provide only minimal levels of respiratory protection to a wearer against virus-size submicron aerosol particles (e.g. droplet nuclei). https://academic.oup.com/annweh/article/54/7/789/202744
If we're looking at an aerosolized virus, we urgently need definitive science in the mainstream media to inform the public whether a cloth mask is actually filtering anything useful.
We will continue to make KN95 and N95 masks with 95% Filtration or greater available for everyone to use.