WASHINGTON, November 10, 2020 -- If you have seen someone wandering around the grocery store or elsewhere with a mask with a valve on it and wondered how safe it is for you, you were right to be ...

A new study using lasers suggests that face shields and masks outfitted with an exhaust valve aren’t particularly great at protecting others from tiny respiratory droplets containing contagious germs ...

Face shields and masks with exhalation valves do not block the spread of small droplets, a new study found. Small, aerosol-sized particles linger in the air for longer periods of time compared to ...