where is anyone ever going to be in the presence of 60-140nm sized particles of covid19 outside of perhaps certain medical procedures ?
You are most likely to be exposed to covid19 via large particles such as are emitted when people cough or sneeze.
https://www.cbc.ca/news/health/masks-coronavirus-1.5507186
read this and maybe stfu
You are most likely to be exposed to covid19 via large particles such as are emitted when people cough or sneeze.
https://www.cbc.ca/news/health/masks-coronavirus-1.5507186
read this and maybe stfu