Indoor Air Quality

Radon

Indoor radon averages, risk categories, and geology notes for 117 communities. Drawn from Health Canada's Cross-Canada Survey of Radon Concentrations in Homes; guideline action level 200 Bq/m³.

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City rankings

Every surveyed community. Sort by mean indoor radon, share of homes above 200 Bq/m³, or risk category.

34 of 34 cities

City ranking table

1.ReginaSKHigh	301.7	56.3%	High
2.WinnipegMBHigh	256.7	47.5%	High
3.SherbrookeQCHigh	238.2	24%	High
4.HalifaxNSHigh	194.7	31.3%	High
5.KingstonONHigh	161	26.3%	High
6.Thunder BayONHigh	159.1	30.4%	High
7.WindsorONModerate	156.4	23.9%	Moderate
8.SaskatoonSKModerate	151.7	21.2%	Moderate
9.KelownaBCModerate	135.3	15.1%	Moderate
10.CalgaryABModerate	135.1	15.2%	Moderate
11.SudburyONModerate	131.2	16%	Moderate
12.GuelphONModerate	130.8	19.8%	Moderate
13.MontrealQCModerate	126.1	14.1%	Moderate
14.Quebec CityQCModerate	119.7	17%	Moderate
15.Saint JohnNBModerate	118.4	16.8%	Moderate
16.EdmontonABModerate	114.1	8.3%	Moderate
17.OttawaONModerate	111.7	10.5%	Moderate
18.GatineauQCModerate	111.7	10.5%	Moderate
19.BrantfordONModerate	111.4	14.1%	Moderate
20.PeterboroughONModerate	101.1	6%	Moderate
21.SaguenayQCModerate	96.1	13.3%	Moderate
22.St. John'sNLLow	94.5	6.7%	Low
23.BarrieONLow	87	4.8%	Low
24.LondonONLow	85.1	7.5%	Low
25.HamiltonONLow	84.9	5.7%	Low
26.MonctonNBLow	81.4	6.7%	Low
27.KitchenerONLow	66.5	1%	Low
28.OshawaONLow	63.4	1.1%	Low
29.AbbotsfordBCLow	61.4	1.2%	Low
30.TorontoONLow	59.7	0%	Low
31.St. CatharinesONLow	57.3	0%	Low
32.Trois-RivieresQCLow	45.1	0%	Low
33.VictoriaBCLow	40.5	0%	Low
34.VancouverBCLow	35.4	1.5%	Low

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.

117

Communities tracked

9 provinces

115 Bq/m³

National avg radon

Sample city mean

13%

Homes above 200 Bq/m³

Average across sample cities

High / very high risk

10 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.

115Bq/m³Guideline watch

0600+Guideline200 Bq/m³

National mean across 117 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.