Sleeping in Montréal… but what exactly are you breathing?
Each night, while you believe you're getting restful sleep in your modern condo in Montréal, your body might actually be battling a silent form of pollution. Invisible pollutants trapped in indoor air build up in poorly ventilated bedrooms and directly affect your sleep quality, health, and overall well-being. At AirGreen, we’re regularly called into newly built residences where indoor air is found to be three to five times more polluted than outdoor air, without residents even realizing it.
The paradox of new condos in Montréal
Airtight bedrooms… but not healthy ones
Recent real estate projects across Montréal — whether in Ahuntsic, Rosemont, Le Sud-Ouest, or Griffintown — are designed to maximize energy efficiency. This results in tight insulation and high-performance windows that virtually eliminate natural airflow.
But the direct consequence is this: indoor air becomes stagnant, and pollutants — often invisible to the eye — begin to multiply.
In a typical condo bedroom, you’ll often find:
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VOCs (Volatile Organic Compounds) released by mattresses, new furniture, and synthetic curtains.
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Formaldehyde emitted by MDF panels or industrial adhesives.
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Fine PM2.5 particles generated by cooking, candles, or even neighbours if the unit isn’t fully sealed.
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A buildup of CO₂ due to human breathing during the night, especially with two people sleeping in a room without ventilation.
The physiological effects of night-time pollution
Sleeping in a polluted room can lead to:
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Poor oxygenation during deep sleep.
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Morning headaches.
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A persistent feeling of fatigue.
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Frequent awakenings or non-restorative sleep.
In one Plateau condo we visited, our team measured morning CO₂ levels as high as 1800 ppm, well above the recommended threshold of 1000 ppm.
Case study: AirGreen intervention in a Griffintown condo
A couple living in a two-bedroom unit in Griffintown contacted us after several months of unexplained sleep disturbances. Despite ideal conditions (quiet, blackout curtains, new bedding), they woke up tired every morning.
Full indoor air quality analysis
We installed a CO₂ sensor and a VOC detector to monitor levels overnight. The results were alarming:
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CO₂ peaked at 2000 ppm by 4 a.m.
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Humidity reached 65%, a perfect breeding ground for mold
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Constant presence of VOCs, despite no noticeable odors
Custom solution by AirGreen
We recommended installing a VENMAR EVO5 700 HRV ERV system, featuring:
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Two ECM motors for ultra-quiet performance
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MERV 13 filtration to capture allergens and microparticles
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Minimal ductwork installation, ideal for a condo layout
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Smart programming, with a silent night mode
The unit was installed in one day, with a discreet duct connecting the bedroom to the bathroom for highly effective cross-ventilation.
Results after one week
The clients immediately noticed:
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Deeper, more restorative sleep
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Fewer night-time awakenings
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A lighter, fresher air feeling
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A reduction in lingering odors from bedding and fabrics
Why air exchangers are essential in bedrooms
At night, air doesn’t renew on its own
Unless you open the window in the middle of winter (not exactly practical in Montréal), the air you breathe from midnight to 8 a.m. is completely trapped. Without an exchange system, it becomes increasingly CO₂-heavy, dry, polluted, and harmful over time.
The air exchanger: the only real solution
Unlike a bathroom fan or a stove hood, a mechanical air exchanger extracts stale air and replaces it with fresh, filtered outdoor air, all while recovering heat. It ensures:
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Better brain oxygenation during sleep
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Reduced allergy and asthma risks
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Stable thermal comfort
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Clean indoor air throughout the night
AirGreen’s practical tips for a healthier bedroom
Do
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Have your air exchanger serviced once a year
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Clean your vent grilles regularly
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Air out the bedroom for a few minutes each morning if possible
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Use hypoallergenic bedding
Don’t
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Use scented candles or synthetic incense
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Diffuse essential oils all night long
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Sleep two people in a room without active mechanical ventilation
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Forget to vacuum under the bed — dust builds up fast
AirGreen: your local expert in residential ventilation
For over 10 years, we’ve been improving air quality in condos throughout Montréal, Laval, Longueuil, the North Shore, and the South Shore, offering real, lasting solutions to the problem of night-time indoor pollution. With technical expertise, a human approach, and deep knowledge of the local real estate landscape, we ensure installations that are clean, efficient, and built to last.