QORVAN

Is My Radon Level Safe?

Enter your radon reading to see how it compares with EPA and WHO guideline levels, and what the recommended next step is for your home.

Updated · 2 min read · By QORVAN Editorial Team · Reviewed by QORVAN Product Team

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There is no known completely safe level of radon. Health agencies set guideline levels that tell you when to take action, but lower long-term exposure is always better. Enter your reading to see how it compares.

Compared against the EPA action level (4 pCi/L), the EPA “consider fixing” range (2–4 pCi/L) and the WHO reference level (100 Bq/m³ ≈ %!f(uint64=2) pCi/L).

What the guidelines say

GuidelineLevelWhat it means
EPA action level4 pCi/L (148 Bq/m³)Fix your home
EPA “consider fixing”2–4 pCi/LConsider mitigation, especially if levels persist
WHO reference level100 Bq/m³ (≈ 2.7 pCi/L)A recommended reference for indoor environments

One reading isn’t the whole story

Radon varies with weather, season and how your home is ventilated. A short test can land on an unusually high or low day, which is why the EPA recommends a follow-up test when a short-term result is 4 pCi/L or higher.

A long-term test or a continuous monitor gives you the average that matters. See short-term vs long-term radon testing, and how to reduce radon if your level is high.

This tool explains your reading against published guideline levels. It is not a substitute for professional radon testing or mitigation advice. If your level is high, follow your state or local guidance and consult a qualified radon professional.

Frequently asked questions

Is 2 pCi/L of radon safe?
It is below the EPA action level of 4 pCi/L, but the EPA still suggests considering mitigation between 2 and 4 pCi/L because risk rises with long-term exposure.
Is 4 pCi/L dangerous?
The EPA recommends fixing a home at 4 pCi/L or higher. It is not an emergency, but it is a level at which action is recommended.
My reading changes every day. Which number counts?
The long-term average. Radon rises and falls with weather, season and ventilation, so a single reading can be unusually high or low. See why radon levels change.

Sources

  1. Health Risk of Radon — U.S. EPA
  2. A Citizen's Guide to Radon — U.S. EPA
  3. Radon and health (fact sheet) — World Health Organization