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4. EPA guidelines for the maximum safe level of radon (a naturally occurring radioactive gas) in...

4. EPA guidelines for the maximum safe level of radon (a naturally occurring radioactive gas) in a home is 4.0 pCi/L (picocuries per liter of air). When a home is tested, a number of measurements are taken and averaged. A homeowner would be concerned if the average radon level is too high.

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