Articles

Flat illustration of a multi-storey care facility with a covered entrance.
Radon in Hospitals, Care Facilities and Correctional Centres
Health Canada treats these buildings as "dwellings" for testing purposes because of high occupancy of long duration. Most are provincially regulated, so no radon-specific limit applies — but staff are... Read more...
Flat illustration of rectangular ductwork with soft arrows suggesting airflow.
Radon, HVAC and Ventilation in Canadian Workplaces
Buildings pull soil gas in through stack effect and mechanical imbalance. Read more...
Flat illustration of a row of low-rise apartment buildings with balconies.
Radon for Landlords, Property Managers and Multi-Unit Buildings
No Canadian jurisdiction requires landlords to test for radon. Read more...
Flat illustration of a low-rise commercial building.
Our Radon Result Came Back at 180 — Are We Finished?
200 Bq/m³ is an action level, not a safety threshold. Radon moves year to year with weather and building operation. Every measurement carries uncertainty, so a reported 180 sits in... Read more...
Flat illustration of a house frame on a foundation slab with a vertical pipe stub inside the footprint.
Radon Rough-In Inspection: A Guide for Builders and Building Officials
The inspection happens before the slab is poured, because most of what matters is buried afterward. It covers the gas-permeable layer, the soil gas barrier, the collector and pipe, sealing... Read more...
Flat illustration of a house frame on a foundation slab with a vertical pipe stub inside the footprint.
Is a Radon Rough-In Mandatory in My Province?
Ontario (2024 OBC, in force since 1 January 2025), British Columbia (2024 BCBC, in force since 8 March 2024) and Quebec (Construction Code) all require radon rough-in provisions in new... Read more...
Flat illustration of a house frame on a foundation slab with a vertical pipe stub inside the footprint.
Radon Rough-In Requirements for Canadian Builders
The 2025 NBC requires a passive vertical radon stack — a pipe from beneath the slab through the roof, ready to accept a fan. But BC, Alberta, Ontario and Quebec... Read more...
Flat-vector office workplace with a radon detector and hard hat — radon at work in Quebec (CNESST)
Radon in the Workplace in Quebec: The Employer's Obligations (CNESST)
Quick answer: Yes — but the details matter. In Quebec, the provincial occupational health and safety regime — the Act respecting occupational health and safety (LSST), enforced by the CNESST... Read more...
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Radon in the Canadian Workplace: A Legal Brief
Federally regulated employers must ensure no employee is exposed to an annual average above 200 Bq/m³ from January 30, 2027 (COHSR s. 10.26(4), as amended by SOR/2026-10). Read more...
Flat illustration of a grid of simple buildings with a few highlighted in a warmer tone.
How to Risk-Rank a Building Portfolio for Radon Testing
Rank on five factors: regional radon potential, ground-contact area and foundation type, occupancy pattern, which floors people actually work on, and building age and construction. The Canadian evidence supports all... Read more...
Flat illustration of a neat stack of blank documents and a folder.
Workplace Radon Compliance Timeline: Why Testing Starts in Fall 2026
January 30, 2027 is the legal date; fall 2026 is the measurement date. An employer who places long-term detectors by early November 2026 has a defensible annual-average measurement in hand... Read more...
Flat illustration of a low-rise commercial building.
Workplace Radon in Canada: 30 Questions Answered
Federally regulated employers must ensure no employee is exposed to an annual average above 200 Bq/m³ from 30 January 2027. Provincially regulated employers have no radon-specific number but owe a... Read more...
Flat illustration of a civic office building with a symmetrical facade and wide front steps.
Canada's New Workplace Radon Limit: SOR/2026-10 Explained
From January 30, 2027, federally regulated employers in Canada must ensure no employee's radon exposure averages more than 200 Bq/m³ over a year — a fourfold tightening of the previous... Read more...
Flat illustration of a civic office building with a symmetrical facade and wide front steps.
Workplace Radon Rules by Province in Canada
Federally regulated workplaces get a hard 200 Bq/m³ annual-average limit on January 30, 2027. Read more...
Map of Canada with a pin on Quebec — radon risk regions of Quebec
Radon Map of Quebec: The Risk Regions
General information for Quebec homeowners, buyers, and renters, drawn from public sources (Health Canada, INSPQ, MSSS, regional public-health authorities, the cross-Canada radon survey). This is not medical or legal advice.... Read more...
Map of Canada with a pin on the Laurentians — radon in Oka, Mont-Laurier and the Basses-Laurentides
Radon in the Lower Laurentians (Basses-Laurentides): Oka, Saint-Joseph-du-Lac, Mont-Laurier and the Risk Areas
The Laurentians (Laurentides) contain some of the best-documented radon hotspots in Canada. The Basses-Laurentides — Oka, Saint-Joseph-du-Lac and the Deux-Montagnes area — sit partly on the Oka carbonatite complex, a... Read more...
Map of Canada with a pin on Chaudière-Appalaches — radon in Thetford Mines and the Beauce, Quebec
Radon in Chaudière-Appalaches: Thetford Mines, the Beauce (Saint-Georges), and the Risk Areas
Chaudière-Appalaches shows one of the clearest radon signals in Quebec. The region sits on uranium-bearing Appalachian bedrock, and when the province screened its schools, the Beauce-Etchemin school board turned out... Read more...