Found in soil, radon gas is a colorless and tasteless gas that is produced by the decay of uranium and radium.Light weight in nature,radon flows up through soil and into a home.High exposure to radon causes lung cancer. Every home has radon,and therefore should be tested.The EPA recommends remediation  If radon concentration is 4.0 pCi/L or greater.  It is also advisable to re-test every few years, or if you or a neighbor excavates for an addition or pool ,which can re-direct pockets of radon into your home. 

*Radon collection procedure*

 A charcoal cannister approx. 4 inches in diameter is placed in the lowest livable space - usually the basement. The cannister is not harmful to people,however it must not be disturbed. The cannister is retrieved after 2-6  days of exposure, and mailed to a licensed lab for processing and preparing a report.