---
title: "Radon Units: pCi/L to Bq/m³ Converter and Guide"
url: https://vermontradon.com/radon-units-pci-l-bq-m3/
description: "Convert radon results between pCi/L and Bq/m³ (1 pCi/L = 37 Bq/m³), and compare the EPA's 4 pCi/L action level with WHO and Health Canada levels."
last_reviewed: 2026-10-17
source: "U.S. EPA; Health Canada; Vermont Department of Health; World Health Organization. Each fact is footnoted to its source below."
publisher: "Vermont Radon, an independent guide, not affiliated with the Vermont Department of Health or EPA. Not medical advice."
---

# Radon units: pCi/L and Bq/m³

In the United States, radon in air is measured in picocuries per liter of air, pCi/L.[^1] Many other countries and some monitors use becquerels per cubic meter, Bq/m³. 37 Bq/m³ is equal to 1 pCi/L.[^2]

## Convert a result

Type in either box. Uses 1 pCi/L = 37 Bq/m³.[^2] Nothing you type is sent anywhere.

## Reference levels compared

| Who | Level | What it means |
| --- | --- | --- |
| EPA | 4 pCi/L (150 Bq/m³) | Fix the home at this level or more.[^3] |
| EPA | 2 to 4 pCi/L (75 to 150 Bq/m³) | Consider fixing; there is no known safe level of exposure.[^3] |
| Vermont Department of Health | 4.0 pCi/L; below 2.0 pCi/L | Reduce radon at or above 4.0, and take action to get below 2.0.[^4] |
| World Health Organization | 100 Bq/m³ (about 2.7 pCi/L) | Recommended national reference level; if that can’t be reached, no more than 300 Bq/m³.[^5] |
| Health Canada | 200 Bq/m³ (about 5.4 pCi/L) | Canada’s guideline for radon.[^6] |

The pCi/L figures in parentheses for WHO and Health Canada are our conversions at 37 Bq/m³ per pCi/L.[^2] Vermont follows the EPA and Health Department levels.[^4]

## Working Levels (WL)

Some professional reports give results in Working Levels. The EPA says that if a result is in WL, fix your home if the working level is 0.016 WL or higher, and notes that some states require WL results to be converted to pCi/L to minimize confusion.[^7]

## What to do with your number

See [Understanding your results](https://vermontradon.com/understanding-results/) for what the Health Department says to do at each level.

## Common questions

### How do I convert pCi/L to Bq/m³?

Multiply by 37: Health Canada says 37 Bq/m³ is equal to 1 pCi/L.[^2]

### What is 4 pCi/L in Bq/m³?

The EPA gives its 4 pCi/L action level as 150 Bq/m³.[^3]

### What does a result in Working Levels (WL) mean?

If a test result is in WL, the EPA recommends fixing your home if the working level is 0.016 WL or higher.[^7]

## Next steps

- [Understanding your results](https://vermontradon.com/understanding-results/)
- [Is radon dangerous?](https://vermontradon.com/is-radon-dangerous/)
- [How to test your home](https://vermontradon.com/how-to-test/)

## Sources

[^1]: **U.S. Environmental Protection Agency**. [A Citizen’s Guide to Radon (EPA 402/K-12/002, 2025)](https://www.epa.gov/sites/default/files/2016-12/documents/2016_a_citizens_guide_to_radon.pdf). Checked 2026-10-17.
[^2]: **Health Canada**. [Guide for radon measurements in homes](https://www.canada.ca/en/health-canada/services/publications/health-risks-safety/guide-radon-measurements-residential-dwellings.html). Checked 2026-10-17.
[^3]: **U.S. Environmental Protection Agency**. [What is EPA’s Action Level for Radon and What Does it Mean?](https://www.epa.gov/radon/what-epas-action-level-radon-and-what-does-it-mean). Checked 2026-10-17.
[^4]: **Vermont Department of Health**. [Radon in Your Home](https://www.healthvermont.gov/environment/healthy-homes/radon). Checked 2026-10-17.
[^5]: **World Health Organization**. [Radon and health (fact sheet, January 25, 2023)](https://www.who.int/news-room/fact-sheets/detail/radon-and-health). Checked 2026-10-17.
[^6]: **Health Canada**. [Government of Canada Radon Guideline](https://www.canada.ca/en/health-canada/services/health-risks-safety/radiation/radon/government-canada-radon-guideline.html). Checked 2026-10-17.
[^7]: **U.S. Environmental Protection Agency**. [Explain Working Levels (WL) and Picocuries Per Liter of Air (pCi/L)](https://www.epa.gov/radon/explain-working-levels-wl-and-picocuries-liter-air-pcil). Checked 2026-10-17.