The air we breathe is not pure and healthy. There are harmful toxic petrol fumes and carbon dioxide emissions. This makes a sufficient reason for you to stay indoors, where you might think you are safe. But what one face indoors can be even more harmful. Indoor air pollution is the degradation of indoor air quality by the presence of harmful chemicals. It can be 10 times worse than the outdoor air pollution because contained areas help the pollutants to build up more than open spaces do.