What is radon?
Radon is a radioactive gas that causes cancer. Radon is found in rock, soil, water, some building materials, and natural gas. You can't see, taste, or smell it.
How does radon exposure occur?
Any home, school, office, or other building can have high levels of radon. Radon is found in new and old buildings. It can seep in through the foundation of a house built on radon-contaminated soil. If a house's water supply contains radon, radon may enter the air inside the house through pipes, drains, faucets, or appliances that use water. Then the radon may get trapped inside the house.
Radon sinks to the low points in buildings, so it often is found in basements. But a building can have high levels of radon even if it doesn't have a basement.
Studies show that nearly 1 out of every 15 homes in the United States has unsafe levels of radon. 1 If you live in an area that has large deposits of uranium, you may be more likely to be exposed to high levels of radon. (To see a map of the U.S. radon zones, see the website www.epa.gov/radon/zonemap.html.) But the construction features and exact location of your house may be just as likely to affect your risk. Even houses right next to each other can have very different radon levels.
What are the health effects of radon exposure?
Over time, exposure to radon can cause lung cancer. Radon causes about 21,000 lung cancer deaths each year in the U.S. It is the second leading cause of lung cancer, after tobacco smoking. 1 People who smoke have an even higher risk of lung cancer from radon exposure than people who don't smoke.
Radon exposure doesn't cause symptoms. Unless your home or office is tested for high radon levels, you may not realize that you are being exposed to dangerous levels of radon until you or someone in your family is diagnosed with lung cancer.
How can you test your home's radon levels?
The U.S. Surgeon General and the U.S. Environmental Protection Agency (EPA) recommend that all homes be tested for radon levels.
You can hire a qualified tester to do the test, or you can use a do-it-yourself test kit. Use only home tests that are labeled "meets EPA requirements." You can buy radon test kits by calling the EPA at 1-800-SOS-RADN (1-800-767-7236). There are two types of tests. Both measure radon levels in the air.
- The short-term test kit stays in your home or office for 2 to 90 days. Radon levels vary daily and from season to season. So you may want to follow up the first short-term test with a second test.
- The long-term test kit stays in your home or office for more than 90 days. A long-term test will give more accurate results.
If you have questions about radon in your house, you can get help from the EPA by calling 1-800-55-RADON (1-800-557-2366).
How do you remove high levels of radon?
If tests find a high level of radon, you'll need to reduce it. There are two parts to this:
- Venting radon out of the building. Simple venting methods are the first step in reducing the level of radon. These may include using fans, blowers, and suction devices to balance the air exchange in crawl spaces, basements, and other areas.
- Preventing radon from entering the building. The most common way to do this is through sub-slab depressurization, which vents air from beneath the foundation. This work should be done by a qualified contractor. Other control methods include sealing cracks in the foundation or walls and using air cleaners. 2
Use an EPA-qualified contractor with proper training in radon reduction to help with this work.
After radon reduction or prevention procedures are done, the home or building should be retested. You may need to retest more than once. It is usually safe to live in the home or building while the radon is being vented, but you may want to confirm this with your local EPA office.
For general information about removing or reducing radon in your house, you can call the Radon Fix-It Hotline at 1-800-644-6999. If you live outside the U.S., you can call your regional environmental protection office for more information.
Frequently Asked Questions
Learning about radon:
Other Places To Get Help
|Agency for Toxic Substances and Disease Registry (ATSDR)|
|1825 Century Boulevard|
|Atlanta, GA 30345|
The Agency for Toxic Substances and Disease Registry (ATSDR), an agency of the U.S. Department of Health and Human Services, works to serve the public by using the best science, taking responsive public health actions, and providing trusted health information to prevent harmful exposures and disease related to toxic substances.
|American Lung Association|
|1301 Pennsylvania Avenue NW|
|Washington, DC 20004|
1-800-548-8252 (to speak with a lung professional)
The American Lung Association provides programs of education, community service, and advocacy. Some of the topics available include asthma, tobacco control, emphysema, infectious disease, asbestos, carbon monoxide, radon, and ozone.
|National Safety Council (NSC)|
|1121 Spring Lake Drive|
|Itasca, IL 60143-3201|
The National Safety Council's mission is to educate and influence society to adopt safety, health, and environmental policies, practices, and procedures that prevent and reduce human suffering and economic losses arising from preventable causes.
|Office of Radiation and Indoor Air, Indoor Environments Division, U.S. Environmental Protection Agency|
|1200 Pennsylvania Avenue NW|
|Mail Code 6609J|
|Washington, DC 20460|
|Phone:||1-800-76-RADON (1-800-767-2366) National Radon Hotline
1-800-55-RADON (1-800-557-2366) National Radon Helpline
The EPA's Radon Web site provides answers to frequently asked questions regarding the possibility of radon exposure in your home. It also provides a list of hotlines, contact information for regional U.S. EPA offices, and links to other radon resources. The Web site offers access to the publication Consumer's Guide to Radon Reduction, which helps you select a qualified contractor to reduce the radon levels in your home, determine an appropriate radon reduction method, and maintain your radon reduction system. You can also learn how to obtain the video "Breathing Easy: What Home Buyers and Sellers Should Know About Radon."
- U.S. Environmental Protection Agency (2009). A Citizen's Guide to Radon: The Guide to Protecting Yourself and Your Family From Radon . Available online: http://www.epa.gov/radon/pdfs/citizensguide.pdf.
- U.S. Environmental Protection Agency (2010). Consumer's Guide to Radon Reduction . Available online: http://www.epa.gov/radon/pdfs/consguid.pdf.
|Primary Medical Reviewer||Anne C. Poinier, MD - Internal Medicine|
|Specialist Medical Reviewer||R. Steven Tharratt, MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology|
|Last Revised||August 15, 2011|
Last Revised: August 15, 2011
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