Right - fair enough. My initial point remains: either masks ARE effective (in which case they will be effective in all contexts, albeit to a greater or lesser extent due to a greater or lesser extent of encountering the virus) or they are not. The official guidance of Feb/March was manifestly BS and that was clear at the time; that the admin on LiveScience bought into it was and remains surprising.They do... its not about the virus size as much as what the virus is riding on. Its riding on water drops or lugies/mucus (see bio aresols) water is to ur lungs as oil is to an engine and talking coughing or just breathing we echale an invisible mist.
The water or mucus drop holding the virus is large enoygh the filters catch it.
Ive got a 3m 6800 full face respirator . I'm really surprised more of these aren't being used by medical professionals. It's a full face shield that seals around the edges of your face and then again around your nose and mouth. I don't have it but there is a kit for this to add a hose and a pump on a battery. This would be ideal because not only does it reduce the strain required from your lungs to pull air through the filter it also has two side effects one is you stay cooler while you wear it instead of humidity building up but this mask is pretty good in the design so that doesn't happen if you quite a while but two is if you have powered air anytime you have a bad seal on the mask are rushes out which tends to keep things from coming in.