Air pollution is everywhere, not just outside. Our homes, offices and schools bring us into contact with various kinds of toxic substances. According to the California Air Resources Board, many pollutants are accumulated indoors, resulting in high levels of pollution. Newer homes are said to be more prone to pollution because the tighter construction does not let particles escape easily. Such pollutants are harmful to our health and in some cases, can prove to be fatal. What we need to do is to find ways in which indoor air pollution can be reduced. Given below are five green ways to reduce pollution indoors.