Reply To: mask effect

My numbers are from the report below. The topic itself is not if my interest, but they provide a very readable review of studies and conclusions that you can look up. It is a good mix of prior research on SARS, flu, etc and recent on COVID. A list of references is on p. 128

Assessment of Risks of SARS-CoV-2 Transmission During Air Travel and Non-Pharmaceutical Interventions to Reduce Risk. Phase One Report: Gate-to-Gate Travel Onboard Aircraft
Prepared by Faculty and Scientists at the Harvard T.H. Chan School of Public Health