Qualité d'air dans les écoles de Laval : résultats chocs d'une étude exclusive AirGreen
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Air quality in Laval schools: shocking results from an exclusive AirGreen study

An exclusive study conducted by AirGreen reveals alarming levels of indoor air pollution in several primary and secondary schools in Laval. Thanks to our recognized expertise in HVAC ventilation and indoor air quality, we were able to accurately diagnose the problems affecting the health of students and staff. This article provides a detailed look at the findings of this study, the solutions implemented, and the concrete impact of installing high-performance mechanical ventilation systems in Laval’s educational institutions.

An unprecedented field study in Laval schools

Last winter, our teams carried out thorough air quality analyses in 15 public schools in Laval, at the request of several school principals concerned about the high rates of absenteeism and widespread fatigue among students.

We used high-precision sensors to measure fine particles (PM2.5 and PM10), volatile organic compounds (VOCs), and CO2 levels. The results were undeniable: in nearly 80% of the classrooms analyzed, concentrations far exceeded the recommended thresholds set by Health Canada, especially in winter when natural ventilation is often limited.

Observed symptoms: clear signs of stale indoor air

School principals and teachers reported recurring symptoms among students:

  • Chronic fatigue and reduced concentration

  • Eye irritation and headaches

  • Increased absences due to respiratory issues

These symptoms are directly linked to a lack of proper ventilation, a structural issue commonly found in school buildings built before modern HVAC ventilation standards.

Outdated or non-existent systems

Our study revealed that in 12 of the 15 schools visited, no mechanical ventilation system was in place. In the few instances where a system existed, it was often outdated, noisy, and inefficient. The indoor air was neither filtered nor renewed, resulting in the accumulation of harmful pollutants.

Installation of a custom HVAC system: the case of Mont-de-La Salle High School

Among the participating institutions, Mont-de-La Salle High School in Laval decided to take swift action in partnership with AirGreen. We designed and installed a heat recovery ventilation (HRV) system combined with high-efficiency GOODMAN central HVAC units in common areas and classrooms.

Technical details of the project:

  • Installed system: GOODMAN R-32 5-ton central HVAC unit

  • Number of air vents: 28 outlets distributed across two wings of the building

  • Filtration: MERV 13 HEPA filters to eliminate allergens and fine particles

  • Heat recovery: 85% efficiency, reducing winter energy consumption

  • Installation time: 6 days during spring break

  • Subsidy received: $14,500 through Hydro-Québec’s LogisVert program

Measured results after installation

Two months after the system was activated, our sensors recorded a 68% drop in CO2 concentrations in classrooms, a 75% reduction in VOCs, and air renewal every 30 minutes. Teachers reported a noticeable improvement in student focus, fewer headaches, and a healthier overall atmosphere.

Why is this still happening in Laval schools?

Despite repeated warnings from public health experts, the majority of schools on the North Shore, and across Québec in general, still lack adequate mechanical ventilation systems. Several factors explain this situation:

  • Lack of targeted funding for HVAC renovations

  • Complexity of carrying out work in older buildings

  • Lack of awareness about the importance of indoor air quality

At AirGreen, we believe that breathing clean air at school should not be a luxury, but a basic right.

Our recommendations for optimal air quality in educational settings

Based on this study, we strongly encourage all school administrators in Montréal, Laval, Longueuil, South Shore, and North Shore to take the following actions:

  1. Conduct a full indoor air quality assessment using professional instruments.

  2. Install HRV systems with HEPA filtration in the most frequented areas.

  3. Opt for high-efficiency HVAC systems to minimize operating costs.

  4. Schedule regular HVAC maintenance to ensure optimal performance.

  5. Apply for LogisVert subsidies or provincial government funding.

AirGreen: concrete solutions for healthier school environments

As a leading expert in HVAC ventilation in Laval, AirGreen is a key player in helping public and private institutions transition to healthier buildings. With our team of HVAC engineers and certified technicians, we design and install custom solutions that meet the strictest air quality standards.

We’ve already completed installations in schools located in Chomedey, Duvernay, Saint-Vincent-de-Paul, and Fabreville, and each project has proven that a healthy learning environment is possible, with the right partner.


Testimonial from a school principal

"We knew the air in our school wasn’t ideal, but we didn’t expect the results to be this bad. Thanks to AirGreen, we now have a ventilation system that works, students who are more alert, and a staff that feels less fatigued. I highly recommend them."
— Mrs. L. D., High school principal in Laval


Conclusion: school air quality is an urgent priority

AirGreen’s exclusive study exposes a silent health emergency in Laval’s schools. With our tailored approach, we’ve shown that it’s possible to improve indoor air quality quickly and effectively. Our high-performance HVAC installations not only protect students' health but also foster an environment conducive to learning.

We invite school administrators, school boards, and property managers to contact us today to schedule a complete audit and discuss a custom installation plan.

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