Linda Geddes, "Covid loses 90% of ability to infect within five minutes in air – study" https://www.theguardian.com/world/2022/jan/11/covid-loses-90-of-ability-to-infect-within-five-minutes-in-air-study

« Coronavirus loses 90% of its ability to infect us within five minutes of becoming airborne, the world’s first simulations of how the virus survives in exhaled air suggest.
The findings re-emphasise the importance of short-range Covid transmission, with physical distancing and mask-wearing likely to be the most effective means of preventing infection. Ventilation, though still worthwhile, is likely to have a lesser impact. »

Nice further specification of how aerosol dissemination and ventilation in closed rooms contribute to spread of virus.