Size of SARS-CoV-2 between 60 nanometers (nm) to a maximum diameter of 140 nanometers (nm) https://www.news-medical.net/health/The-Size-of-SARS-CoV-2-Compared-to-Other-Things.aspx The pore size of masks ranged from 80 to 500 μm https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6599448/ BTW 1000 nm = 1 μm
@gerdmoebehrens the masks are effective in filtering out the water droplets that the virus travels in. An infected person doesn't exhale virus particles, they exhale droplets containing the virus.
