Indoor Air Quality

Radon

Indoor radon averages, risk categories, and geology notes for 343 communities. Drawn from Health Canada's Cross-Canada Survey of Radon Concentrations in Homes; guideline action level 200 Bq/m³.

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Indoor air quality

Radon Levels Across Canada

Mean indoor radon, share of tested homes at or above Health Canada's 200 Bq/m³ guideline, and regional geology for every tracked community.

343

Communities tracked

13 provinces

106 Bq/m³

National avg radon

Sample city mean

11%

Homes above 200 Bq/m³

Average across sample cities

High / very high risk

13 cities above reference level

Test for radon at home

Health Canada recommends every Canadian home be tested. Start with a long-term kit on the lowest occupied level.

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Reading the scale

Radon Risk Gauge

Mean indoor radon plotted against Health Canada's 200 Bq/m³ guideline and the 600+ Bq/m³ upper range in our sample.

106Bq/m³Guideline watch

0600+Guideline200 Bq/m³

National mean across 343 surveyed communities. Individual home levels vary; test your property for a definitive reading.

Risk ramp key

200 Bq/m³ guideline

Low · < 100 Bq/m³
Watch · 100–199 Bq/m³
Reference · 200 Bq/m³
Elevated · 200–600 Bq/m³
High · > 600 Bq/m³

From geology to indoor levels

Understanding Radon Risk By City

Radon is a colourless, odourless gas from uranium in soil and rock. Survey means describe participating long-term tests, not every dwelling. Health Canada recommends three-month (or longer) tests on the lowest lived-in level, ideally in heating season; C-NRPP professionals handle measurement and mitigation when results are elevated.