MIT researchers say time spent indoors increases risk of #Covid at 6 feet or 60 feet in new study challenging social distancing policies

The risk of being exposed to Covid-19 indoors can be as great at 60 feet as it is at 6 feet in a room where the air is mixed.
Existing safety guidelines have omitted too many factors to accurately quantify the risk of airborne transmission, such as time, mask use and ventilation rates.
Bazant and Bush question long-held Covid-19 guidelines that recommend 6 feet of distance between people..