Remember the beautiful air close to waterfalls? Or on a dewy, fresh-air morning? Or after a thunderstorm? Or in the rain forest?
These are all places rich in negative oxygen ions and our body just loves breathing them. It feels nourishing and energising. We move on, feeling regenerated and fresh.
Indoor air easily gets depleted of the essential negative oxygen ions by electrostatic surfaces, heating and air conditioning, see research in Information pages.