The Port of Seattle became the first governmental entity in the region to roll out a face mask requirement for everyone in public areas on Port property Saturday. SeaTac Airport is included in that mandate. On Friday, Seattle Mayor Jenny Durkan announced that an ordinance was in the works that would at least cover retail spaces open to the public in Seattle. A number of stores in Seattle, including Costco, already require such masks in order to be in the store.
King County Metro does not require the wearing of face masks while on board, but strongly urges customers to wear them.
While face masks are helpful to protect people around the wearer from getting the virus from the wearer, they are no substitute for a medical grade face mask if the goal is to protect the wearer from getting the virus. Regardless, they are believed to have helped slow the spread of the virus in areas where wearing them in public has been encouraged.