How COVID-19 can spread – Workplace Insight
The acts of breathing, talking, coughing and sneezing all produce droplets and aerosols that may, if the host is infected, contain pathogens. Larger droplets fall by gravity within 2m from the source, which is why social distancing is recommended. Smaller aerosols, however, can stay airborne for hours, which enables them to travel longer distances where they could infect secondary hosts, particularly in poorly ventilated spaces.
4th March 2021
Public Health England published this guidance