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Evaluating and Assessing Radon Testing in Multifamily Housing.

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Current radon testing protocols for multifamily housing are insufficient. Testing only 10-25% of units misses many high radon levels, necessitating 100% testing for accurate radon mitigation assessment.

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Area of Science:

  • Environmental Health
  • Public Health
  • Building Science

Background:

  • Radon mitigation in multifamily housing requires reliable testing procedures.
  • Current protocols for testing ground-contact units vary significantly (10% to 100%).

Purpose of the Study:

  • To estimate the probability of failing to detect units with elevated radon levels when not all ground-contact units are tested.
  • To inform optimal radon testing strategies in multifamily buildings.

Main Methods:

  • Retrospective analysis of data from 7892 ground-contact units in 687 US multifamily buildings.
  • Application of hypergeometric and Monte Carlo statistical methods.
  • Evaluation of confidence in identifying radon levels of 4 picoCuries/liter (pCi/L) or more based on varying test percentages.

Main Results:

  • Approximately 15% of tested units exceeded the EPA action level of 4 pCi/L.
  • Current federal protocols (10% and 25% testing) failed to identify 47%-69% and 32%-46% of units with elevated radon, respectively.
  • Testing 90% of units still missed up to 4% of high-radon units.

Conclusions:

  • 100% testing of ground-contact units is required to achieve 95% confidence in identifying all units with radon levels of 4 pCi/L or more in buildings up to 20 units.
  • For the majority of multifamily buildings, comprehensive radon testing of all ground-contact units is recommended.
  • Accurate radon testing is crucial for effective radon mitigation and occupant protection.