"Radon gas was responsible for more than 20,000 American deaths in 2008. Most of the victims never knew they had a radon problem. January is National Radon Action Month. Testing for radon in 2009 will save lives."The Health and Press Association is encouraging Americans to test their homes for the invisible killer, radon gas. Radon causes more than 20,000 preventable deaths each year in the United States. All areas of the country are at risk; so all homes should be tested. It is easy and inexpensive to test for this deadly gas. Since you cannot see it, smell it, or taste it, the only way to know if a home is affected by radon is to test.