Some researchers argue that because the risk of outdoor Covid-19 transmission is minimal, the focus of mask-wearing should be on indoor gatherings.
The commentary piece, published in The BMJ, debates the significance of mask-wearing in outdoor settings. On one side of the debate are experts from the University of California, while researchers from the University of St Andrews represent the opposite point of view.
The group of researchers from the University of California believe wearing masks should be mandatory during outdoor events. They note that indoor transmission risks compared with outdoors vary, but that indoor transmissions are four to 20 times more likely than outdoors.