Airport operations firm Finavia, as well as the Parliament House, announced new guidelines for face mask usage.
As of Tuesday, passengers and others visiting the country's airports will be required to wear face masks at all times, according to news service STT.
Finavia previously issued face mask recommendations in May.
The firm said that it wants to protect passengers and staff, as well as draw attention to the idea that travelling safely is possible.
Finavia said that it is concerned that the government's coronavirus-related travel restrictions have nearly brought air traffic to a standstill.
Parliamentary committees to wear masks
Meanwhile, face mask recommendations are also expanding in Parliament, according to the institution's communications department.
In addition to the recently-required use of masks during plenary sessions, legislators will also need to wear the protective devices when in committee meetings.
The mask recommendations also apply to members of the media.
No further guidance on mask use has been issued regarding other premises of Parliament. Guided tours of the facility will not be carried out during November and December. The visitor's centre has been closed since March 12, due to the coronavirus situation.
Additionally, the plenary public gallery is also closed until the end of the year.