When we’re spending more time inside our home can start to smell stuffy, particularly if we can’t open the windows because it seems hot or cold outside—and stuffiness is bad for our wellbeing, mood, and cognitive performance. So, adding very faint, light amounts of air scents can seem like a good idea. But which ones are best? Science has clearly established the effects different scents can have on what goes on in our head: Smelling pleasant scents boosts our mood,…