Jacqueline Howard – CNN – Face masks offer the most protection against the spread of virus-carrying particles in the air when everyone wears them. But research also suggests that masks can protect the wearer alone, by acting as a barrier between particles and their nose and mouth.
“I was actually travelling by plane yesterday when the mask requirement on public transit was removed. I definitely kept my mask on throughout my flight,” Chris Cappa, a professor of civil and environmental engineering at the University of California, Davis who studies aerosol particles and masks, wrote in an email Tuesday.
