For the purposes of the corona virus outbreak, there are three main types of masks: respirators, surgical masks, and fabric, or homemade, masks. N95 respirators are considered the gold standard for those on the frontlines. When worn properly securely fitted to a wearer face, they offer protection from about 95% of small particles (0.3 microns in size) and large droplets. Individual corona virus particles are smaller than this. But when they are coughed or sneezed up, they likely travel in small clumps of spit and mucus.
The WHO and the CDC only recommend N95s for health care workers at the greatest risk of virus exposure, such as those who test patients for COVID-19 by swabbing their noses or mouths or those who connect patients to respirators. In an ideal setting, N95s are only worn once and then tossed out. But due to supply shortages, health care workers are having to repeatedly wear the respirators, raising questions about whether the masks are getting contaminated from repeated exposures and removals. No one is recommending the public wear N95 respirators.
But still, they are far from perfect.
Those materials do not keep the tiny viral particles from entering your breathing zone from behind … Read the rest