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Radon Facts

Basic Facts About Radon

RADON

There is no scientific doubt that Radon gas is a known human lung carcinogen. Prolonged exposure to high levels of Radon gas can cause lung cancer. Millions of homes and buildings contain high levels of radon gas. EPA's efforts are directed at locating the homes with high levels and encouraging remediation of them.

As a means of prevention, EPA and the Office of the Surgeon General recommend that all homes below the third floor be tested for Radon. Because Radon is invisible and odorless, a simple test is the only way to determine if a home has high radon levels. EPA recommends mitigating homes with high Radon levels and there are straight-forward reduction techniques that will work in virtually any home.

Most homes won't have a Radon problem, but there is a simple test to find out if you do or don't have high Radon levels in your home.

Sources of Radon
Earth and rock beneath home; well water; building materials.

Health Effects From Exposure to Radon
No immediate symptoms. Estimated to contribute to between 7,000 and 30,000 lung cancer deaths each year. Smokers are at higher risk of developing Radon-induced lung cancer.

Radon Levels in Homes
Based on a national residential radon survey completed in 1991, the average indoor radon level is 1.3 picocuries per liter (pCi/L) in the United States. The average outdoor level is about 0.4 pCi/L.

Steps to Reduce Exposure to Radon
  • Test your home for radon.

  • Fix your home if your radon level is 4 picocuries per liter (pCi/L) or higher.

  • Radon levels less than 4 pCi/L still pose a risk, and in many cases may be reduced.

For more information about radon, click here.


Source: Environmental Protection Agency


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