Although close contact transmission is the dominant transmission route, long-range airborne transmission through small size infected aerosols plays an important role in spreading COVID-19 in indoor spaces. Ventilation is air exchange between inside and outside; it dilutes the concentration of contaminants, and hence helps to control aerosol-based cross-infection risk of COVID-19.

The AIVC project “Ventilation, airtightness and COVID‐19” collects, discusses and disseminates information about COVID‐19 in relation to ventilation and airtightness. Since its launch, in September 2020, the project’s working group have produced:


If you have specific questions related to COVID-19 and ventilation, please let us know by writing an email to