The current recommendation here is to air out for 5-10 minutes, 3 times a day. Not just one window open, but full airing out with as many open windows and doors

The current recommendation here is to air out for 5-10 minutes, 3 times a day. Not just one window open, but full airing out with as many open windows and doors as possible. It's a good habit to get into, no matter how old and drafty or new and tightly sealed your house is.