People today face many serious illnesses, and pollution is one of the causes. The most serious problem is air quality. We build too many factories and release too much smoke into the atmosphere, and it makes the atmosphere worse and worse. We breathe in all the harmful chemicals directly and I don't know why people don't see this as a serious problem. One very easy thing most of us can do to help improve air quality is to switch to public transport. 10 people may need 10 different motorbikes, but we can reduce emissions from those motorbikes by using buses or subways. We also rely too much on air conditioners, which have a negative effect on the air, and it would be better if we could use fans instead of air conditioners on days that are not too hot. Air is very important to us, and we need to keep it clean to live a healthy life.