The recommendation applies at the airports Arlanda, Landvetter, Bromma, Malmö, Luleå, Umeå, Åre, Visby, Ronneby and Kiruna. The recommendations have started to apply gradually, starting with Arlanda on Monday.

Formally, this is an adaptation to safety protocols from the European Aviation Safety Authority EASA, says Lovisa Ernestam at Swedavia's press service.

- There is an expectation that people should wear mouthguards at airports, not least internationally. In addition, most aircraft are required today.

TT: What happens if you don't wear a mouthguard?

- No one is being rejected. But perhaps the staff will come forward and inform about the possibility of buying mouthguards at the airport, says Lovisa Ernestam.

On the other hand, mouth protection is a requirement for staff working at Swedavia's airports with close contact with travelers.