· 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.
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 — even when wearing a mask, according to a new study by Massachusetts Institute of Technology researchers who challenge social distancing guidelines adopted across the world.
Bazant and Bush question long-held Covid-19 guidelines that recommend 6 feet of distance between people from the Centers for Disease Control and Prevention in a peer-reviewed study published earlier this week in Proceedings of the National Academy of Science of the United States of America. They say staying 6 feet away from another person may not be enough when people are inside for prolonged periods of time.
Small, poorly ventilated spaces where a lot of people spend a lot of time together places people at the most risk, he said.
Those droplets from a person’s warm exhalation mix with body heat and air currents in the area to rise and travel throughout the entire room and put everyone in a well-mixed room at risk of airborne transmission.