Untested Basement Radon

Lower-floor living space, never tested for radon.

41Moderate burden · out of 100

Cleaner swapA cheap radon test kit, then mitigate if high

How this score is built

100Start
63.2Chemical hazard 8 × 4.6−36.8
46.2Everyday exposure 5 × 3.4−17
41Persistence 2 × 2.6−5.2
ModerateThe band41 sits in 40–59.

What each input rests on

The three ratings behind the score, and the studies each rests on
Input	Rating	Evidence
Chemical hazard	8/10	Pooled individual data from 13 European case-control studies (7,148 lung-cancer cases, 14,208 controls): lung-cancer risk rose 16% per 100 Bq/m³ of usual home radon, linearly with no threshold; the authors estimate residential radon causes about 2% of cancer deaths in Europe. Radon in homes and risk of lung cancer: collaborative analysis of individual data from 13 European case-control studies · BMJ 2005 DOI 10.1136/bmj.38308.477650.63 · PMID 15613366 · Abstract, Results · read 2026-10-21
Everyday exposure	5/10	unsourced input
Persistence	2/10	unsourced input

Ratings are editorial. A study listed here supports the rating; it did not compute it. How the index is built

What this means for you

The chemical-hazard rating is what drives the score down. Radon is the second-leading cause of lung cancer and is completely invisible. A one-time test is among the highest-value things on this whole list.

Evidence strength: strong

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