It is harmlessly dispersed in outdoor air, but can threaten human health when it accumulates in buildings.
Radon is a radioactive decay product of radium, which in turn is a decay product of uranium.
Uranium and radium are naturally occurring common elements in soil. Radon inspections are performed by placing the proper testing media in the correct locations to monitor the home or using one of the high grade electronic monitors. We use the high grade electronic monitoring because they are more accurate and the results are faster, usually provided the day the test is completed.