You silly silly person. Your link refers to filtering bacteria. Medical masks are quite effective against a virus encapsulated in snot, but otherwise a virus is small enough to pass straight through
You're a real stable genius. However, although virus and bacteria vary in size, it is the
droplets of saliva and respiratory fluids in which those virus and bacteria are contained and live and for which "out in the street", as you suggested needed study, ordinary masks are used to
reduce droplet spread and subsequent viral transmission. To your relief, if you
try looking, you can find countless studies which have been conducted or are ongoing regarding masks and viral transmission.
To feed your scientific wisdom and quench your thirst for studies of the effectiveness of various types of masks used in various conditions and scenarios, might I suggest using your google machine? I'm sure that you can find studies that satisfy your ideological needs and prove your independence of thought. In
every field, there are
all types of people. For instance, with only casual effort invested in browsing thru the internet, I have seen ample anthropological and zoological evidence that most squirrels can easily locate all the nuts they require to sustain themselves. Much like social media.
Naturally, the better the mask (tighter fit, finer filtering, etc.), the greater the
reduction in transmission will be. Now, elimination and reduction of transmission are not the same thing. The former would require extreme and nearly impossible effort; while the latter simply requires some common sense. If you believe that the goal of mask wearing should be the elimination of transmission, I would encourage you to don your scuba gear when engaging in public. You'll make quite the impression as a truly independent thinker of sound scientific reasoning. Alternatively, you could look for a good deal on a
hazmat suit.