“Good ventilation can help reduce the risk of spreading coronavirus, so focus on improving general ventilation, preferably through fresh air or mechanical systems.”

HSE UK

UK Government guidance for working safely in shops, ‘Ventilation into the building should be optimised to ensure a fresh air supply is provided to all areas of the facility and increased wherever possible’ ,updated 23 July 2020,

American Airlines
UK Government

World Health Organization acknowledges that coronavirus can linger in the air, 10 July 2020,

“In revised guidelines issued Thursday, the WHO recommended avoiding enclosed spaces with poor ventilation as well as crowded places”

costain
World Health Organization