To make a long story short, it doesnt matter much.So if 10K microbes get released into the air vs.1K, the same number of people will get exposed even though there will be a lower concentration of the virus
Lets say you're on a bus or streetcar thats packed with people. And you release 10K microbes in one breath vs. 1K.
That would be great if you stayed on that bus for 1 breath, except you don't.
You stay on that streetcar or bus probably for hundredths (if not thousands) of breaths before you either get off, or transfer onto the next bus so you can infect more zombies!
You dont seem to understand, this virus is airborne, people who are in close proximity of each other (like on a bus, streetcar or subway) WILL infect each other, regardless of whether they are wearing a mask. The only mask that might make a difference is an N95 mask, but very few are wearing those