Radon Frequently Asked Questions
What is radon?
Radon is a naturally occurring radioactive gas found in soils, rock, and water throughout
the U.S. Radon causes lung cancer, and is a threat to health because it tends to collect in homes, sometimes to very high
How can radon affect people's health?
Almost all risk from radon comes
from breathing air with radon and its decay products. Radon decay products cause lung cancer.
There is no safe
level of radon -- any exposure poses some risk of cancer. In two 1999 reports, the National Academy of Sciences (NAS) concluded
after an exhaustive review that radon in indoor air is the second leading cause of lung cancer in the U.S. after cigarette
smoking. The NAS estimated that 15,000-22,000 Americans die every year from radon-related lung cancer.
do I know if there is radon in my home?
You cannot see, feel, smell, or taste radon. Testing your home is
the only way to know if you and your family are at risk from radon. EPA and the Surgeon General recommend testing for radon
in all rooms below the third floor.
Radon testing is inexpensive and easy--it should only take a few minutes of
your time. Millions of Americans have already tested their homes for radon. Various low-cost, do-it-yourself test kits are
available through the mail and in hardware stores and other retail outlets. You can also hire a trained contractor to do the
testing for you.
What can I do to protect myself and my family from radon?
The first step
is to test your home for radon, and have it fixed if it is at or above EPA's Action Level of 4 picocuries per liter. You
may want to take action if the levels are in the range of 2-4 picocuries per liter. Generally, levels can be brought below
2 pCi/l fairly simply.
The best method for reducing radon in your home will depend on how radon enters your home
and the design of your home. For example, sealing cracks in floors and walls may help to reduce radon. There are also systems
that remove radon from the crawl space or from beneath the concrete floor or basement slab that are effective at keeping radon
from entering your home. These systems are simple and don't require major changes to your home. Other methods may be necessary.
People who have private wells should test their well water to ensure that radon levels meet EPA's newly proposed
For more information, read the EPA's A Citizen's Guide to Radon and How to Find a Qualified Radon Service Professional in Your Area
The above information is provided as a public service by the Environmental Protection Agency for educational purposes.