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Radon at Home


Did you know...?

  • Radon is the second leading cause of lung cancer, after smoking?
  • Approximately 20,000 cancer deaths each year are caused by radon?
What is it?

Radon is a radioactive gas that cannot be seen, smelled or tasted and is found naturally around the country. When you breathe air containing radon, the sensitive cells in your airway are irritated, increasing your risk of getting lung cancer.


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Radon is found in the dirt and rocks beneath houses, in well water and in some building materials. It can enter your house through soil, dirt floors in crawlspaces and cracks in foundations, floors and walls. Once inside, radon gas can sometimes get trapped inside the house.

All houses have some radon, but houses next to each other can have very different radon levels, so the only way to measure your particular risk is to test your own house. Radon is measured in “picoCuries per liter of air,” abbreviated “pCi/L.” This measurement describes the number of radon gas particles in one liter of air. The amount of radon outdoors is usually around 0.4 pCi/L, and indoors is around 1.3 pCi/L. Even though all radon exposure is unhealthy, radon at levels below 4 pCi/L are considered acceptable. If your home has more than 4 pCi/L, you should take action to lower this level.
What can you do?
Test your Home!

About one out of every 15 homes has a radon problem, and yours could be one of them! The only way to know for sure is to test your home. You can buy a radon test at a hardware store or order it About one out of every 15 homes has a radon problem, and yours could be one of them!by mail. There are two types of tests: short-term tests take two days, while long-term tests take around 90 days but give results that are slightly more accurate.

Follow All the Test Kit Instructions

If possible during the test, keep your windows closed to keep air from escaping. Place your test kit in a room on the lowest level of your home that you use regularly, probably on the first floor or in the basement. When the test is done, send it to a lab to process your results.

Instead of doing the testing yourself, you can hire a professional tester to do it for you. Contact your state’s radon office for a list of qualified testers.

Fix It!

It is possible to lower the levels of radon, and the risk of lung cancer, in your home. Most of the time, this will involve removing radon gas from underneath your concrete floor, crawlspace, or foundation before it can enter your home. This will require special knowledge and skills and you will need to hire a professional contractor to help you reduce the levels of radon in your home. If you are considering fixing your home's radon problem yourself, you should first contact your state radon office for guidance and assistance.

More Things You Can Do
  1. Stop smoking and discourage smoking in your home. Smoke increases the risk of lung cancer from radon.

  2. Increase air flow in your house by opening windows and using fans and vents to circulate air. Natural ventilation in any type of house is only a temporary radon reduction approach because of the following disadvantages: loss of heat or air conditioned air, related discomfort and increased costs, and security concerns.

  3. Seal cracks in floors and walls with plaster, caulk or other materials designed to seal cracks and gaps. Contact your state radon office for a list of qualified contractors in your area and for information on how to fix radon problems yourself. Always test again after finishing to make sure you’ve fixed your radon problem. If you are buying a new home, ask whether radon-resistant construction techniques were used. It is almost always cheaper and easier to build these features into new homes than to add them later.



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HHI is committed to accuracy of content and correcting information that is incomplete or inaccurate. With our broad scope of coverage of healthful indoor environments, and desire to rapidly publish info to benefit the community, mistakes are inevitable. HHI has established an error correction policy to welcome corrections or enhancements to our information. Please help us improve the quality of our content by contacting with corrections or suggestions for improvement. Each contact will receive a respectful reply.

The Healthy House Institute (HHI), a for-profit educational LLC, provides the information on as a free service to the public. The intent is to disseminate accurate, verified and science-based information on creating healthy home environments.


While an effort is made to ensure the quality of the content and credibility of sources listed on this site, HHI provides no warranty - expressed or implied - and assumes no legal liability for the accuracy, completeness, or usefulness of any information, product or process disclosed on or in conjunction with the site. The views and opinions of the authors or originators expressed herein do not necessarily state or reflect those of HHI: its principals, executives, Board members, advisors or affiliates.

Radon at Home:  Created on February 17th, 2007.  Last Modified on October 31st, 2009


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