Daikin: About the importance of Indoor Air Quality
Indoor environments contribute significantly to exposure to air pollutants. People spend almost 90% of their time indoor, where air quality can be affected by penetrating outdoor air, specific indoor pollution sources and lack of air exchange.
Some pollutants may even be more concentrated indoor than outdoor. That means that Indoor air quality, whether it is at home, office, or hotel rooms, it can be 2 to 5 times worse than outdoor air.