تلوث الهواء قطعة قراءة ستيب رقم 40

نص القطعة

Air pollution is a very dangerous phenomenon, especially in this age where air pollutants are everywhere. When we think about air pollution, we always think about the outside and atmosphere air pollution, which is just the smaller part of the air pollution that is harming us. The other part is indoor air pollution. This type of pollution is very dangerous as research shows that people spend 90% of their time staying at home. So, if the indoor air is polluted, we are in a continuous harmful environment. One of the main reasons for indoor air pollution is lack of fresh air in the house. Homes should have a proper ventilation system that allows the fresh air from outside to come inside and the bad air to go outside. However, this in itself is an issue as people tend to save energy by not allowing hot air from outside to come in as the air conditioners have to exert more energy to cool the house. Therefore, all the bad air is kept inside the house which causes the indoor air pollution.