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.
Although lung cancer is the leading cause of cancer death in the U.S. in both men and women, both the occurrence of lung cancer and the deaths related to it can be reduced. More than four out of every five cases of lung cancer are associated with cigarette smoking. The cause-and-effect relationship has been extensively documented. During the 1920s, large numbers of men began to smoke cigarettes, presumably in response to increased advertising. Twenty years later, the frequency of lung cancer in men...
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 lungcancer, 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?
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.