There is big news for victory over the pandemic: Covid-19 virus is airborne, that is the disease spreads by people breathing very small particles suspended in the air.
Size and weight of the droplet is important. Big heavy droplets can be trapped by a facial mask, but very small airborne particles will go right through it. So, masks won't stop you from getting sick. (Studies are listed here.)
World Health Organization (WHO) claimed back in 2020 that Covid-19 was spread by big droplets -- not airborne. Why they claimed this "fact check" is not clear.
That same year (2020), 239 scientists came together to claim that it is airborne, and that it should be fought in the air.
There's something more effective against Covid-19 that works and should have been pursued earlier in the pandemic. It's called "ultraviolet disinfection" and it destroys the virus in the air. Too bad it was ignored for so long.
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