If you’ve tested your home for radon, you’ll receive a result measured in picocuries per liter (pCi/L). But what does that number actually mean? Here’s a clear breakdown of radon levels and what action you should take.
How Radon Is Measured
Radon concentration in indoor air is measured in picocuries per liter (pCi/L). In some countries, the unit used is becquerels per cubic meter (Bq/m³). To convert: 1 pCi/L = 37 Bq/m³.
EPA Radon Level Guidelines
- 4 pCi/L or above — Take action. The EPA recommends fixing your home at this level.
- 2–4 pCi/L — Consider mitigation. The EPA suggests taking action even at these levels.
- Below 2 pCi/L — Lower risk, but no level is completely safe.
Average Radon Levels
- Average U.S. indoor radon level: 1.3 pCi/L
- Average outdoor radon level: 0.4 pCi/L
WHO Recommendation
The World Health Organization recommends a reference level of 2.7 pCi/L (100 Bq/m³). If this cannot be achieved, the level should not exceed 5.4 pCi/L (200 Bq/m³).
What To Do Based on Your Results
- Below 2 pCi/L: Continue monitoring. Retest every 2 years.
- 2–4 pCi/L: Consider hiring a certified mitigation contractor. Retest after any renovations.
- 4 pCi/L or above: Act promptly. Contact a certified radon mitigation professional.
Ongoing Monitoring Is Key
Radon levels can change over time due to seasonal shifts, renovations, or changes in ventilation. A continuous electronic radon monitor gives you real-time data year-round, so you’re never caught off guard.
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