Radon, The 'Silent Killer'

Studies from various health organizations have revealed that radon exposure is linked to lung cancer. The National Cancer Institute led a study of 68,000 underground miners who were exposed to varying levels of radon. The study found the miners were dying of lung cancer at five times the rate of the population. Having bad indoor air quality in schools can not only affect a child's ability to learn, but also increase the risk for short-term health problems, according to the EPA. (Environmental Protection Agency)