exp

So could this be more about sizes of droplets containing virus particles? That is the heavier droplets will fall because of their weight but the lighter droplets or aerosols remain suspended in the air longer and can be carried longer distance by the HVAC.

Or they just build up and you get a cloud of aerosols. Even though they carry much less virus load per aerosol than large droplets, collectively they may pose a transmission factor if enough of them build up and form a cloud in indoor spaces where people spend a long time, such as bars, night clubs, restaurants, etc.

It would be more alarming if there would be documented cases of aerosols causing infection outside. But there's no easy way to differentiate between whether people were infected by droplets or aerosols or maybe even fomites.