- Pollution is one of the major problems in most of the parts of the world. When you go out on the street you might have to face different kinds of pollution problems. But do you know that pollution can even reach to your house. Indoor air pollution has become quite common these days. This has become a common cause of concern these days. It is very important to make sure that you work hard to improve the indoor air. You might be aware of the fact that you need to clean your air ducts from time to time to keep the indoor air clean.