n95 mask filters out 95% of all particles larger than 0.3 microns the CoVid19 virus is 1000 times smaller than that
it's like trying to use a chicken wire fence to stop mosquitoes
n95 mask filters out 95% of all particles larger than 0.3 microns the CoVid19 virus is 1000 times smaller than that
it's like trying to use a chicken wire fence to stop mosquitoes