(this study was retracted with no reason given - Chinese government pressure?)
How one man spread coronavirus to NINE other people on his bus in China: Scientists find the deadly virus can travel four times the 'safe' distance and linger in the air for over 30 minutes in confined places
https://www.dailymail.co.uk/news/article-8094933/How-one-man-spread-coronavirus-NINE-people-bus.html