Nowadays, people have to face a lot of serious diseases, and pollution is one of the causes. The most serious problem is the air quality. We build too many factories and release too much exhaust fumes into the atmosphere, and it makes the air become worse and worse. We inhale all of the harmful chemicals directly, and I do not know why people are not taking it seriously. A very easy thing that most of us can do to help improve the quality of air is switching to public transportations. 10 people may need 10 different motorbikes, but we can reduce the exhaust fumes from those motorbikes by using the bus or subway. We also depend too much on air conditioners which also create negative effects to the air, and it is better if we can use fans instead on the not too hot days. The air is very important to us, and we need to keep it clean in order to have a healthy life.