We spend about 90% of our life in indoor spaces, so it is important that the air we breathe in them are healthy! There are air pollutants with different origins, such as the activities of people, facilities, furniture, construction materials, cleaning products. Some of them generate discomfort, like smells. Others are even dangers for our health, such as allergens, radon gas, volatile organic compounds. There is only one way to keep our air in good condition: to renew the indoor air at regular intervals.