Source: https://canada.constructconnect.com/joc/news/ohs/2021/10/ventilation-a-powerful-aid-in-covid-prevention-toolbox

Ventilation can be a powerful tool in preventing the spread of COVID-19, especially as inclement weather sets in and construction workers are in closer quarters or warming stations.
Conditions are especially challenging for construction industry as it deals with shielded or partially constructed buildings when weather is a consideration to renovations that have an operating HVAC systems in place. Authorities point out that finding the right ventilation protocol will depend on the building site and that ventilation is only another layer in the defence against the virus spread. Yet, it remains an important facet.