Radon and Thoron Data From Canadian Homes

Radon (Rn-222) is the second leading cause of lung cancer after tobacco smoking. It can easily move through small spaces in soils and other materials, allowing it to enter buildings and accumulate to levels that can pose a health risk. Health Canada recommends that all Canadians test their home for radon and remediate if levels are higher than 200 becquerels per cubic meter (Bq/m³).

In order to better understand the risk to Canadians from exposure to radon and thoron, the National Radon Program (NRP) conducted an indoor residential measurement survey in 2012-2013 to gather information on radon and thoron levels across the Census Metropolitan Areas (CMA) in Canada.

Data and Resources

Additional Info

Field	Value
Last Updated	April 17, 2026, 19:28 (UTC)
Created	April 17, 2026, 19:28 (UTC)
contact_email	radonsurveys-enquetessurleradon@hc-sc.gc.ca
contact_person	{}
criticality_level	[]
data_dictionary	[]
geographic_scope	[]
open_canada_collection	primary
open_canada_date_published	2018-07-23 00:00:00
open_canada_keywords	{"en": ["National Radon Program", "Bq/m³", "radon", "Rn-222", "thoron", "Rn-220", "CMA", "Census Metropolitan Area", "survey", "random digit dialing", "homes", "radon measurement"], "fr": ["Programme national sur le radon", "Bq / m³", "radon", "Rn-222", "thoron", "Rn-220", "RMR", "région métropolitaine de recensement", "enquête", "composition aléatoire", "habitations", "mesure du radon"]}
open_canada_subject	["health_and_safety"]
sensitivity_level	unrestricted
title_fr	Donnees du radon et thoron de la maisons Canadiennes
update_frequency	as_needed