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EPA sets the "Action Level", the level at which mitigation should occur, at 4.0 pCi/L. I agree with @Henry Jackson, if you got 2 short-term test results that averaged 1.7 then continue to use the space as before. The reason for 2 short term tests is to rule out high levels that would pose an immediate threat. You should now conduct a Long-Term Test for a ...


As you have probably learned doing research, there isn't a hard-and-fast cutoff between "safe" and "dangerous". But 2.0 pCi/L seems to be the threshold for considering remediation, and that's for a living space. If you're using the room for exercise you'll probably only be spending a few hours per week there, which would dramatically reduce your exposure. ...

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