Date Published: 02/23/2007 [Source]
While the lung cancer risks associated with cancer have been known for more than 40 years, most of us don't think about radon, the colorless, odorless radioactive gas that may be seeping into our homes, posing an increased risk to our health. And, combined with smoking, radon is especially dangerous.
The EPA has set a level of 4 picocuries per liter as the level at which the homeowner should take action.