Researchers from Harvard T.H. Chan School of Public Health have assembled a national database with millions of multi-day ...

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 ...