World Ventil8 Day (#WorldVentil8Day) aims to promote the critical role of better building ventilation in supporting health, well-being and productivity. The campaign website (worldventil8day.com) includes a range of free resources including “top facts” about the role of ventilation, and the different methods that can be adapted depending on the age, design, location, and purpose of the building. It also explains how building operators can manage the complex trade-off between ventilation, energy consumption, climate change, urban pollution, noise, comfort and security.