Since the infrastructure is not currently in place and most do not have any control on the indoor air quality of buildings they visit or work, another ward is a well fitting respirator. Respirators protect individuals who are healthy and help reduce the chance of individuals who are sick from infecting others even in well ventilated places where short-range transmission is a concern.
Yes, respirators actually work, read this thread to learn how ( https://pingthread.com/thread/1602994049815908353 ). 21/