More experts are recommending wearing an N95 if you have one to better protect against new variants, although the CDC has said they should be reserved for medical workers. Legitimate N95s can be difficult for regular consumers to find.

The risk level of your setting is important, says Joseph Allen, director of the Healthy Buildings Program at the Harvard T.H. Chan School of Public Health. You probably don’t need to wear an N95 if you’re going on a walk with a friend or to the playground outside. But if you’re working indoors in a restaurant or grocery store, or going to an indoor location with many people, it’s a good idea to wear one.

In hospitals, N95s are carefully fitted. So look for leaks around your face, says Rachael Mary Jones, an associate professor in the department of family and preventive medicine at the University of Utah. “You have to pinch the metal tab at the top of the nose very firmly, to the point where it feels uncomfortable, to get it to conform to the shape of your face,” says Dr. Jones.

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