Radon is a naturally occurring radioactive gas. It comes from the decay of uranium that is found in nearly all soils. It is a Class A human carcinogen that claims approximately 21,000 lives annually in the United States as the leading cause of lung cancer in non-smokers. Radon gas is colorless, odorless, and without taste. The presence of radon in a home cannot be detected by human senses.
The Illinois Radon Awareness Act is an attempt to educate everyone involved in Real Estate transactions to this danger. The only way to know if a home contains radon gas is to test. Both the EPA and the State of Illinois recommend that homes with average Radon concentrations 4.0 pCi/L or higher be mitigated. There are straight-forward reduction techniques that will work in almost any home. As protection against fraud, Illinois has separate licenses for Radon Testing and Radon Mitigation. The same person cannot provide both services to the same address.
Please see the following document for additional information.