If air quality gets over a threshold value get a reminder to open the windows for circulation.
This recepie will remind you to open the windows allowing circulation to improve indoor air quality. The trigger value is a bit arbitary but I recommend that you measure the air quality in your home for a couple of days and then find a value that seems suitable for you. Keep in mind that opening the windows to improve air quality only works if you live in a place where outdoor air quality is still better then indoor air quality. ;)