Major U.S. airlines are banning their customers from using face masks that have vents or exhaust valves.
The policy shift comes after the CDC released guidance claiming the extra feature defeats the point of wearing masks in the fist place.
“The purpose of masks is to keep respiratory droplets from reaching others to aid with source control,” said the agency’s guidance. “However, masks with one-way valves or vents allow air to be exhaled through a hole in the material, which can result in expelled respiratory droplets that can reach others.”
“This type of mask does not prevent the person wearing the mask from transmitting COVID-19 to others.”
American Airlines is the latest to update their mask policy, joining Alaska, Delta, JetBlue, Southwest, Spirit and United airlines.