Indoor air is polluted by a seemingly endless list of sources. It’s everything from excess CO2 to food particles from cooking, pet hairs, moisture from baths, showers and washing machines. 65% of all Europeans dry clothes indoors at least once a week, which gives off damp, and approximately ten litres of liquid are produced by the average family every day. Studies have also found that children’s rooms are often the most polluted in a home. 45% of all children’s bedrooms have much too high levels of CO2 due to insufficient ventilation.