We're talking here about the kind of what masks most people are wearing today, which are either at least two ply, reasonably well fitting cloth face masks, or garden variety off the shelf.
They're called surgical masks, but I've worn actual surgical mask was caught cost five times as much and fit better. So they're not really surgical masks. They're more like clinical use masks that you can buy fairly cheap but places everywhere from Harbor Freight to Walgreens or whatever. You can buy them lots of places, but they're called surgical masks and they're made of the same kind of material.
That's the kind The stuff we're talking about lightweight, all over the place can get them anywhere these days, garden variety masks, somebodies respiratory droplets of the size that can carry viral particles, or that can carry flu particles or the carry cold viruses, or that carry a whole bunch of other sensitive viruses that only biologists bother to memorize all the names for.
Tthey catch the respiratory droplets that carry those, when you exhale, they catch them with somewhere between 65 and 85% efficiency, depending on the specifics of the masks. So most effective when they're catching stuff coming out of the breathers, respiratory tract.
But also, they're stopping something like 60% of incoming particles that are already in the air that somebody less careful has exhaled at is bringing it in
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