Date Published: 05/24/2008 [Source]
Countless homes have been spruced up with granite countertops; as they've grown in popularity, so has concern they could be giving off dangerous radon gas. The Marble Institute of America, examined the 13 most popular granites. It finds the granites are insignificant contributors to radon levels in the home and that most of them are safe. The easiest way to test your countertops is to go in with a radon detector and measure near the surface in the kitchen. Measure the kitchen air, measure on the surface of the counter top.