Look at this:
www.theguardian.com/world/2020/sep/30/germans-embrace-fresh-air-to-ward-off-coronavirus
Germany is making ventilation a key component to fighting the coronavirus spread. Makes sense. At home the windows are usually open. I open windows at work for ventilation, especially now and for safety reasons for the virus in case anyone is infectious and we don't know it yet.
I am a nanny and the family I work for is absolutely allergic to having some windows open. I hate it. I go about opening windows to ventilating the place to try and keep us all safe. But they go around closing them again.