Date Published: 10/17/2008 [Source]
The highest emission rates for granite countertops ever reported in scientific literature result in concentrations that are hundreds or even thousands of times lower than the EPA's guidelines. To test your home for radon, you can buy a home test kit or order one online at http://www.radon.com. You can also hire a professional. If you do get a high reading there are specialized venting systems that can reduce the gas to a safe level.