There is no known safe level of exposure to radon.
The EPA is expected to begin requiring Radon Testing in all homes in the near future.
The EPA strongly recommends that you install mitigation measure in your home if your test results in Radon concentrations of 4 picocuries (pCi/L) or more.
If your test shows between 2 and 4 pCi/L, it would be prudent to consider purchasing a long-term monitoring device such as this . We are a certified Radon firm performing 48-Hour Radon Testing in accordance with the Real Estate Industry standards.