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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.
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 any opening where the building contacts the 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.
Studies show that nearly 1 out of 15 homes in the United States has
unsafe levels of radon.footnote 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.
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.footnote 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.
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-RADON (1-800-767-7236). There are two types of tests. Both measure radon levels in the air.
The EPA recommends placing the test kit in your home on the lowest level that you regularly use. 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).
If tests find a high level of radon, you'll need to reduce it. There are
two parts to this:
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.
Learning about radon:
U.S. Environmental Protection Agency (2012). A Citizen's Guide to Radon: The Guide to Protecting Yourself and Your Family From Radon. Available online:http://www.epa.gov/radon/pubs/citguide.html.
U.S. Environmental Protection Agency (2010). Consumer's Guide to Radon Reduction. Available online: http://www.epa.gov/radon/pdfs/consguid.pdf.
ByHealthwise StaffPrimary Medical ReviewerAnne C. Poinier, MD - Internal MedicineE. Gregory Thompson, MD - Internal MedicineKathleen Romito, MD - Family MedicineSpecialist Medical ReviewerR. Steven Tharratt, MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology
Current as ofMay 7, 2017
Current as of:
May 7, 2017
Anne C. Poinier, MD - Internal Medicine & E. Gregory Thompson, MD - Internal Medicine & Kathleen Romito, MD - Family Medicine & R. Steven Tharratt, MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology
To learn more about Healthwise, visit Healthwise.org.
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