Air Quality Guide

We Measured CO₂ in Montreal Public Spaces — Our Gym Hit 3,700 ppm (Real 2026 Data)
Real CO₂ measurements from around Montreal: a budget gym sustained 3,500–3,700 ppm (about 8× outdoor air), a cinema lobby hit 1,200 ppm, and one packed brunch spot stayed healthy the whole time. Original 2026 field data. Read more...
Aeris View vs Aranet4 (2026): An Honest Comparison From the Aeris Founder
Aeris View ($179 CAD, on-device trend chart, no app needed, made in Montreal) vs Aranet4 HOME (multi-year battery, pressure sensor, e-ink). A spec-by-spec comparison — written by the Aeris founder, including where the Aranet4 wins. Read more...
CO₂ Monitoring for Airbnb and Short-Term Rental Hosts: A Smart Safety and Hospitality Investment
Smoke detectors. Carbon monoxide detectors. Fire extinguisher. These are the safety basics that every short-term rental host knows to provide — and in most jurisdictions, is legally required to install. But there's a fourth measurement that progressive hosts are beginning to add, not because regulations require it yet, but because guest experience, repeat bookings, and emerging regulatory trends all point in the same direction: indoor CO₂ monitoring. If you host on Airbnb, VRBO, or any short-term rental platform, understanding CO₂ monitoring — what it is, why it matters, and how... Read more...
7 Proven Steps to Dramatically Improve Your Home's Air Quality (Starting Today)
Indoor air quality is one of those topics that feels overwhelming when you first encounter it: VOCs, PM2.5, CO₂, radon, formaldehyde, dust mites, mold spores… the list of potential contaminants seems endless, and the implied solution — replace all your furniture, renovate your ventilation system, install a whole-home air purification setup — feels expensive and impractical. But here's the reality: a handful of simple, low-cost steps can dramatically improve the air quality in your home. Most are free. None require professional installation. And combined, they can move your indoor environment... Read more...
Your Pet Is Breathing Your Indoor Air Too — What Every Pet Owner Needs to Know
When we think about creating a healthy home environment, we think about ourselves and our children. Our pets — who in many households are as central to family life as any other member — are rarely considered in the air quality conversation. But they should be. Your dog or cat breathes the same air you do, for the same hours you do, and in many physiological ways is even more vulnerable to poor indoor air quality than you are. Understanding the air quality implications of pet ownership — and pet... Read more...
Air Quality and Mental Health: The Surprising Link Scientists Are Only Beginning to Understand
Mental health has, for most of the history of psychiatry, been conceptualized as a product of genetics, childhood experience, life events, and neurochemical imbalances. The environment — not the social environment, but the literal physical environment — has been an afterthought. But a growing body of research is challenging that omission. The air we breathe, researchers are finding, may have measurable effects on our mood, anxiety levels, cognitive resilience, and long-term mental health outcomes. This is early science. The mechanisms are not fully understood, the effect sizes are being debated,... Read more...
What CO₂ Levels Actually Feel Like: From 400 ppm to 3,000 ppm — Explained
Parts per million. It's a unit that sounds precise and scientific but tells you very little on its own. What does 1,200 ppm of CO₂ actually feel like to be inside? How does 2,500 ppm affect your ability to think? And is there a noticeable difference between 600 ppm and 900 ppm? This article answers those questions directly — taking you through the full spectrum of indoor CO₂ concentrations you're likely to encounter, what each one means physiologically, and what the lived experience at each level actually looks like. 400–500... Read more...
Why Schools Are Installing CO₂ Monitors — And What Parents Can Do Right Now
In the wake of the COVID-19 pandemic, a quiet revolution began in schools around the world. Driven by the recognition that good ventilation dramatically reduces airborne pathogen transmission, school boards and governments began investing in ventilation improvements and, crucially, monitoring systems to verify their effectiveness. CO₂ monitors — once the domain of laboratories and commercial HVAC engineers — began appearing in classrooms. And what they found changed the conversation about education environments permanently. The data from early monitoring programs was, in many cases, alarming. Classrooms that had never been measured... Read more...
The Remote Worker's Complete Guide to a Health-Optimized Home Office
The remote work revolution gave millions of people control over their work environment for the first time. For many, that control has been exercised thoughtfully: standing desks, ergonomic chairs, external monitors, acoustic panels, proper lighting. These are all legitimate investments in comfort and performance. But there is one dimension of the home office environment that receives almost no attention in the productivity literature, despite having the largest documented impact on cognitive performance: the quality of the air in the room. You can have the perfect desk setup, the fastest internet,... Read more...
The Hidden Danger in Your Walls: High Humidity, Mold, and Indoor Allergies
The sneezing that doesn't seem to be triggered by pollen season. The chronic nasal congestion that persists regardless of the time of year. The mysterious respiratory issues that flare up at home but improve when you travel. The faint musty smell in the basement that you've almost stopped noticing. These are classic warning signs of a home with a humidity problem — and the biological consequences of that problem are living in your walls, floors, and air right now. Indoor humidity control is one of the most impactful and most... Read more...
Restaurant, Café, and Co-Working Space Air Quality: Why Busy Indoor Spaces Need Monitoring Most
You've chosen your favorite café as a work spot. The coffee is good, the music is right, and something about the space just makes you more productive than your home office. You order a second americano and settle in for a focused afternoon session. Three hours later, you walk out feeling — surprisingly drained. You chalk it up to the intensity of the work. But there's another explanation worth considering: the air you were breathing for three hours may have been working against you. Restaurants, cafés, coworking spaces, and other... Read more...
How High Indoor CO₂ Silently Destroys Your Focus, Memory, and Decision-Making
You sit down to work, fully intending to tackle the complex project that requires your best thinking. Two hours later, you've answered emails, reorganized files, and browsed the internet — but the important work remains untouched. You tell yourself you're avoiding it. You blame distraction or procrastination. But the more uncomfortable possibility is that your brain literally wasn't operating at the capacity needed for the task — and the culprit was the air you were breathing. The relationship between indoor CO₂ and cognitive performance is one of the most underappreciated... Read more...