I read somewhere that in Germany it is (or was) traditional to "luften" the rooms of a house every day by opening the windows for a while to let fresh air in (e

I read somewhere that in Germany it is (or was) traditional to "luften" the rooms of a house every day by opening the windows for a while to let fresh air in (even in the winter). After hearing about this I started doing it myself, and I feel like it's improved the experience of working from home. Even when the subzero temps descend on my city in the next few days, I'll open a few windows for a while just to make sure the air stays fresh.