Zone 2 (37–74 Bq/m 3) cuts across the country, keeping just south of Colorado and Kansas, as it crosses Oklahoma, northern Texas ... again as radon gas. Much of the low radon map overlays ...

Over 83 million people around the U.S. live in residences with radon levels over the EPA's action level, new data reveals.

A new map has revealed that up to 25 percent of Americans live in areas where radon levels are considered unsafe by the Environmental Protection Agency (EPA). Radon is a radioactive gas that has ...