The US Centers for Disease Control and Prevention (CDC) has ordered Americans to wear masks on all forms of public transport, including airplanes, trains, and buses. They also must remain masked up in airports and bus terminals.

Starting from February 1, people in the US must wear masks on planes, trains, subways, buses, taxis, ships, and ferries. They must do the same in transportation hubs, including airports, train stations, and bus terminals.

Transportation companies and personnel were instructed to deny service to mask less passengers and to otherwise enforce the new rules.

The CDC said that surgical masks and N95 respirators fulfill the requirements of the order. Homemade masks are permitted too, as long as they completely cover the nose and mouth, and are “a solid piece of material without slits, exhalation valves, or punctures.”

Masks should have ear loops or elastic bands, and should “fit snugly but comfortably against the side of the face,” the CDC added.

This makes the new rules less stringent than, for example, those in Austria, which recently instructed citizens to only wear higher-grade FFP2 respirators on public transportation and in supermarkets. In Germany, the orders are strict as well, with only higher-grade surgical masks and N95 and FFP2 respirators allowed.