The need for clean air in our homes should not be underestimated. Canadians spend an average of 90% of their time inside. Our homes contain many substances that may be hazardous to our health. Indoor air pollutants range from minor such as dust and animal dander to major such as molds or chemicals. It is important to be aware of how air contaminants can affect our health and take corrective measures that will improve the quality of air in our homes.