HKU mechanical engineering study reveals airborne transmission of COVID-19 opportunistic in nature and poor indoor ventilation plays a role in transmission - All News - Media - HKU
▻https://www.hku.hk/press/news_detail_21290.html
In short-range airborne transmission of diseases, droplet concentrations in the exhaled jet of air from an infected person continually decrease away from the mouth and the exhaled jet becomes sufficiently weakened to be indistinguishable from the background room air at a distance of approximately 1.5 m. However, if air ventilation is insufficient, the short-range airborne transmission route can be extended to result in a long-range airborne route to infect more people beyond the proximity (opportunistic airborne).