The Transportation Security Administration will now require its workers to wear face masks at screening checkpoints.
The agency said the measure will help reduce the spread of COVID-19 and raise overall health and safety in airports.
"TSA is making this change to protect our employees and travelers as social distancing cannot always be maintained in the screening process," TSA Administrator David Pekoske said in a statement.
Video: Travelers take airlines' mask requirements in stride
Passengers are encouraged to wear facial protection, the TSA also noted, adding that "individuals may be asked to momentarily lower their facial covering for identity verification purposes, or if screening equipment alarms on it."
The change will be introduced in coming days.