"In outdoor environments where distancing is not possible, the use of face masks should be considered", to limit the transmission of Covid-19.
This is underlined by the document of the European Center for Disease Prevention and Control (Ecdc) 'Considerations for the use of face masks in the community in the context of the Sars-CoV-2 Omicron variant of concern'.
Omicron, it reads, "has a significant uptake advantage and increased risk of home transmission over Delta."
It is also more stable on plastic surfaces and human skin than the Wuhan strain and Delta.