New study reported earlier this month, seems to show that viable (ie live virus which could infect someone) was captured from the air in a hospital room with Covid-19 patients, up to 4.8m away from them.
Comments on Twitter have suggested that hospital ventilation needs to be looked at and that cloth masks might not offer enough protection.
Obviously, more research is needed.
https://www.medrxiv.org/content/10.1101/2020.08.03.20167395v1