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the claim

Radon mitigation systems reduce indoor radon concentrations by up to 99 percent.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that radon mitigation systems reduce indoor radon concentrations by up to 99 percent?

Partly. A systematic review and an energy study describe sub-slab depressurization as an effective radon mitigation method, but neither reports a percentage reduction. One reference work reports depressurization systems reducing indoor radon by 45-90 percent, which falls short of the claimed up-to-99 percent figure.

Verdict: CONTESTED PARTIAL · 2 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Radon interventions around the globe: A systematic review.
2019
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Khan, S. M., Gomes, J., & Krewski, D. R. (2019). Radon interventions around the globe: A systematic review.. doi.org. https://doi.org/10.1016/j.heliyon.2019.e01737

Evidence against · 1
Radon
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Radon. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Radon

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More for · 1
Regional and national estimates of the potential energy use, energy cost and CO2 emissions associated with radon mitigation by sub-slab depressurization
1996
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Regional and national estimates of the potential energy use, energy cost and CO2 emissions associated with radon mitigation by sub-slab depressurization. (1996). doi.org. https://doi.org/10.1016/s0378-7788(96)00977-2

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