# Mandatory radon testing when homes are sold, with subsidised mitigation

Source: https://onco.cc/ideas/idea-prev-radon-testing-at-property-sale/  
OnCo record `idea-prev-radon-testing-at-property-sale` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Radon gas from the ground is the second biggest cause of lung cancer. Testing every home at sale and paying for fixes in high-radon areas would prevent thousands of cases.

## Summary

Radon gas from the ground is the second biggest cause of lung cancer, yet testing is voluntary and rare, so this idea mandates radon testing when homes are sold in high-radon zones and subsidises mitigation. Point-of-sale mandates already work for energy efficiency certificates, and mitigation is cheap and effective. The aim is to halve the proportion of homes above the action level in high-radon areas within ten years, evaluated by measured indoor radon distributions and modelled lung cancers averted. The test is adoption in one region with radon levels and mitigation rates compared against controls. Speculative in maturity, it addresses the bottleneck Prevention we already have is not deployed and links to NSCLC.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: Mandatory testing at sale plus subsidies halves the proportion of homes above the action level in high-radon areas within ten years.
- Rationale: Point-of-sale mandates work for energy efficiency certificates; mitigation is cheap and effective.
- Proposed test: Adopt in one region; compare radon levels and mitigation rates with controls.
- Maturity: speculative
- Actor: policy

## Sources

- Bottleneck evidence (Prevention we already have is not deployed): Islami et al., Proportion of cancer attributable to modifiable risk factors (CA 2018): https://doi.org/10.3322/caac.21440

## Connected records

- cancers: [Non-small-cell lung cancer](https://onco.cc/cancers/nsclc/)
- fronts: [Prevention & Risk](https://onco.cc/fronts/prevention/)
- bottlenecks: [Prevention we already have is not deployed](https://onco.cc/bottlenecks/b-prevention-adoption/)
- key papers: [Proportion and number of cancer cases and deaths attributable to potentially modifiable risk factors in the United States](https://onco.cc/key-papers/paper-islami-ca-cancer-j-clin/)
- roadmaps: [Cancer prevention roadmap: tobacco control and vaccines → biomarker-guided chemoprevention → interception in carriers](https://onco.cc/roadmaps/prevention-roadmap/)

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