radon mitigation
First question: Has it been determined by a licensed air quality engineer that your home has a radon problem? Assuming the answer it "yes", then you will need to have a licensed radon mitigation specialist address the problem.
What brk-Int says is totally correct, but you need a licensed mitigation specialist to do it to cover you insurance-wise and Code-wise.
If it makes you feel any better, New Hampshire is VERY high in residential radon cases simply because NH is very high in radon.
Good Luck.
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