“I would not go into a grocery store without a mask,” says John Swartzberg, clinical professor emeritus of infectious diseases and vaccinology at the University of California, Berkeley. “I wouldn’t go into rapid transit without a mask. I wouldn’t go into an airplane or be in an airport without a mask,” nor would he attend a crowded outdoor event such as a concert without one, Swartzberg says. See details in this story from the Guardian:
And in this story from NPR: https://www.npr.org/2022/12/11/1142099805/indoor-masking-advised-washington-california-new-york