Date Published: 01/28/2009 [Source]
Indoor air quality is important because the majority of people spend 90 percent of their time inside buildings. People exposed to indoor air hazards, such as contaminants or hazardous substances, may increase their risk for allergies, asthma, cancer and emphysema.
An additional hazard is radon gas, which can cause lung cancer. Test kits are available at hardware stores or at a discount from http://mn.radon.com.