Radon is a naturally-occurring radioactive gas and is estimated to cause thousands of deaths each year and is the second leading cause of lung cancer. It comes from the natural breakdown of uranium in soil, rock and water and gets into the air you breathe, is found all over the U.S. and can get into any building type.
The Environmental Protection Agency (EPA) recommends that homes be repaired if the radon level is 4 picoCuries per liter (pCi/L) or higher. Radon levels less than 4 pCi/L can pose a risk, and in many cases may be reduced.
Once you have tested your home and found that you have dangerous or elevated levels of radon present, you need to consider radon mitigation. Make sure your contractor is properly trained and certified.
Some radon reduction systems can reduce radon levels in your home by up to 99%. Even very high levels can be reduced to acceptable levels. Based on a national residential radon survey completed in 1991, the average indoor radon level is about 1.3 picocuries per liter (pCi/L) in the United States. The average outdoor level is about 0.4 pCi/L. In some states, like Minnesota, levels tend to be higher.
Fore more information, contact the EPA at www.epa.gov/region5 or call (800) 621-8431.