Radon: An Invisible Threat Lurking in Basements Across Quebec
Few homeowners on the North Shore realize just how critical their ventilation system can be as a first line of defense against radon, the invisible and odorless radioactive gas. And yet, in areas like Blainville, Terrebonne, Mirabel, or Repentigny, radon levels can reach alarming concentrations in basements—especially in homes built without efficient ventilation systems or those that are poorly maintained.
At AirGreen, we’ve been called in to intervene in multiple homes and small residential buildings across the North Shore, where radon test results revealed excessive levels requiring immediate action. In this article, we share our field expertise, the hidden dangers of radon, and how a well-designed ventilation system can quite literally safeguard the health of your household.
Understanding Radon: A Natural Gas With Serious Consequences
Radon is a naturally occurring radioactive gas that comes from the breakdown of uranium in soil. It seeps into buildings through cracks, drains, construction joints, and poorly sealed foundations. Since it’s heavier than air, it tends to build up in basements and lower levels.
Prolonged exposure to radon is the second-leading cause of lung cancer in Canada, according to Health Canada. Any concentration above 200 Bq/m³ is considered a health risk. Yet many homes across the North Shore exceed this level without their owners even knowing it.
Why Ventilation Is Key to Diluting and Expelling Radon
One of the most effective ways to reduce indoor radon concentration is to install or upgrade a controlled mechanical ventilation system (CMV), or to integrate a whole-home air exchanger.
Here’s why:
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Good ventilation ensures continuous air renewal, preventing radon from accumulating.
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It creates a slight positive pressure in the building, which reduces suction of air from the ground.
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When paired with a heat recovery ventilator (HRV), it evacuates radon without compromising energy efficiency.
The AirGreen Approach on the North Shore: Case Studies and Concrete Solutions
On the North Shore, we’ve been hired for multiple residential cases where owners detected radon through testing. Here are two real examples:
Single-Family Home in Boisbriand
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Radon test result: 356 Bq/m³
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Home built in 1995 with no air exchanger
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Solution: installation of a central ventilation system with a heat recovery ventilator (HRV), combined with passive basement ventilation
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Result: radon level dropped to 87 Bq/m³ after 10 days
Triplex in Saint-Eustache
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Radon test result: 478 Bq/m³ on the ground floor unit
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Cracks in flooring and poor foundation sealing
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Solution: installation of a dual-flow HRV, sealing the foundations, and implementing targeted mechanical ventilation in the laundry room
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Result: radon levels brought below the recommended threshold in all 3 units
Mistakes to Avoid If You Suspect Radon in Your Home
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Not testing at all: a radon test is simple, inexpensive, and recommended every 5 years
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Thinking opening windows is enough: this is only temporary and offers no long-term control
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Neglecting maintenance of your HVAC system: a dirty or improperly adjusted air exchanger can worsen the problem
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Hiring non-experts: only a certified HVAC specialist like AirGreen can offer a lasting, effective solution
Our Concrete Recommendations for Homes on the North Shore
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Get your radon level tested if you haven’t done so yet
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Ensure your HRV/ERV system is properly sized for your home’s square footage
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Schedule a full annual maintenance of your ventilation system
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In homes with finished basements, install dedicated active ventilation at the lower level
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Seal all cracks and underground openings properly
Why Choose AirGreen to Protect Your Home from Radon?
At AirGreen, we’re trusted across Greater Montreal for our effective, long-lasting, and tailored HVAC solutions. We work with the best air exchanger brands, design personalized plans for each home, and respond quickly throughout the North Shore and beyond.
By choosing our team, you benefit from:
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Technicians specialized in ventilation and air treatment
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High-efficiency systems, eligible for government grants
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A turnkey service: diagnostics, installation, maintenance
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True peace of mind for your family’s health and safety
Conclusion: Ventilating Means Preventing an Invisible Danger
Radon makes no noise, gives off no smell—yet it can be lethal over time. On the North Shore, homes are particularly at risk. By optimizing your ventilation system with AirGreen, you’re doing more than improving indoor comfort: you’re protecting your household’s health.