How often should a VisiblAir CO2 sensor be calibrated?

Check calibration every 6 to 9 months. Let the sensor stabilize outdoors for 5 to 10 minutes at least 6 feet away from people, doors, windows, and vehicles. If it reads outside the 400 to 450 ppm range, recalibration is recommended.

Do VisiblAir Wi-Fi air quality sensors work without Wi-Fi?

Yes. Compatible VisiblAir sensors can keep measuring and storing data locally when Wi-Fi is unavailable, then sync readings to the cloud portal when connectivity returns.

What does the TVOC or VOC index value represent on Model E-Lite and Model O?

VisiblAir uses an index-based VOC reading to summarize changing volatile organic compound levels from common indoor sources such as cleaning products, furniture, and building materials. Higher values indicate poorer indoor air quality and a greater need for ventilation.

Which air quality monitor is best for classrooms, offices, and homes?

The best model depends on deployment. Model F fits portable spot checks, Model D suits battery-powered logging without Wi-Fi, Model E-Lite is a connected indoor monitor for homes and classrooms, and Model O adds multi-sensor monitoring with USB-C or PoE power for larger spaces.

Air Quality Monitors and CO2 Sensors for Healthier Spaces

Canadian-made indoor air quality sensors for CO2, PM2.5, VOC, temperature, and humidity in homes, schools, offices, and commercial spaces.

Health Protection

Monitor PM1.0, PM2.5, PM10, VOCs & CO2

24/7 Monitoring

Real-time data with cloud connectivity

Explore Products Compare Models

CO₂ Carbon Dioxide

PM2.5 Fine Particles

VOC Volatile Organic Compounds

PM10 Coarse Particles

Why Monitor Air Quality?

The air you breathe directly impacts your health, productivity, and well-being. Invisible pollutants can cause serious health issues without you even knowing.

Respiratory Health

PM2.5 particles are 30 times smaller than the width of a human hair and can penetrate deep into your lungs, causing respiratory issues and cardiovascular problems.

PM2.5: 2.5μm

Cognitive Performance

High CO2 levels (>1000 ppm) can reduce cognitive function by up to 21%, affecting decision-making, concentration, and productivity.

CO2: >1000ppm

Home & School Safety

VOCs from cleaning products, furniture, and building materials can cause headaches, dizziness, and long-term health effects.

VOCs: 0-500 index

The Invisible Threats in Your Air

Understanding what we monitor helps you make informed decisions about your indoor environment.

CO₂

Carbon Dioxide

The Silent Productivity Killer

Sources:

Human respiration
Combustion appliances
Poor ventilation

Health Impact:

Fatigue & drowsiness
Reduced concentration
Headaches

400-800 ppm: Good

800-1200 ppm: Moderate

>1200 ppm: Poor

Particulate Matter

Microscopic Airborne Particles

Types:

PM1.0: Ultrafine particles
PM2.5: Fine particles
PM10: Coarse particles

Sources:

Wildfire smoke
Cooking & cleaning
Outdoor pollution

0-12 μg/m³: Good

12-35 μg/m³: Moderate

>35 μg/m³: Poor

VOC

Volatile Organic Compounds

Everyday Chemicals in the Air

Sources:

Cleaning products
Paints & solvents
New furniture

Health Impact:

Headaches & nausea
Eye & throat irritation
Long-term exposure risks

0-200 index: Good

200-400 index: Moderate

>400 index: Poor

Our Products

Model C – Smart CO₂ Sensor

CO₂, temperature, humidity monitoring with cloud portal.

$209.00 CAD

More Details

Model F – Portable CO₂ Sensor

Portable CO₂ sensor with color LCD display and data logging for on-the-go monitoring.

More Details

Model D – Battery-Powered CO₂ Sensor

Reliable CO₂ sensor with integrated battery and local data logging. Ideal for IAQ spot checks, classrooms, offices, and inspections without Wi-Fi.

$199.00 CAD

More Details

Model E-Lite: Complete Air Quality Sensor

CO2, PM, VOC, temperature, humidity, barometric pressure monitoring.

starting at $285.00 CAD

More Details

Model O: Advanced Multi-Sensor Monitor (2026 Edition)

Comprehensive air quality monitoring with CO2, PM, VOC, NOX, temperature, humidity.

$265.00 CAD (Pre-order)

More Details

Model X2: Enhanced Exterior Sensor

Advanced outdoor monitoring with PM, VOC, temperature, and humidity sensors.

$249.00 CAD

More Details

Buying Guides and Popular Support Topics

Use the pages below to compare models, answer common pre-purchase questions, and pick the right air quality monitor faster.

Compare Air Quality Monitors

See which VisiblAir model fits portable checks, classrooms, offices, PoE installations, or outdoor monitoring.

Compare Models

CO2 Sensor Calibration

Learn when to check calibration, what outdoor readings to expect, and when recalibration is needed.

Read the Guide

VOC and TVOC Meaning

Understand what the VOC index means on connected VisiblAir sensors and how to react when values rise.

See VOC Guidance

Outdoor Sensor Maintenance

Keep outdoor PM and weather-exposed sensors accurate with quick checks for dust, insects, and airflow blockages.

Maintenance Tips

VisiblAir Cloud Portal

Take control of your indoor air quality with the VisiblAir Cloud Portal—your real-time dashboard for air quality insights!

✅ Live Data & History: Monitor CO₂, PM, VOCs, temperature, humidity, and more from anywhere.
✅ Graph Zoom & Pan: Dive into the details with smooth zooming and panning on historical data.
✅ Multi-Device Support: Track multiple sensors across different locations—all in one place.
✅ Smart Alerts: Get notified when air quality dips, so you can take action fast.
✅ Open & Transparent: Export your data anytime—because you own your air quality information.

About VisiblAir

At Visiblair, we make air quality monitoring accessible, reliable, and insightful. Here's what sets us apart:

Open and transparent data: Full access to your readings with no locked analytics.
Built for everyday use: Models designed for homes, schools, workplaces, and field spot checks.
Right to repair: User-serviceable parts and 3D-printable case files where applicable.
Flexible connectivity: Wi-Fi, Ethernet, USB-C, and PoE options across the lineup.
Actionable monitoring: Precise sensors for CO2, particulate matter, VOC, humidity, and temperature.

For more details about our story, click here.

Frequently Asked Air Quality Monitor Questions

These are the questions people ask most often before buying a CO2 monitor or connected indoor air quality sensor.

Check calibration every 6 to 9 months. Let the sensor stabilize outdoors for 5 to 10 minutes away from people, doors, windows, and vehicles. If it reads outside the 400 to 450 ppm range, recalibration is recommended. Read the full calibration guide.

Model F is built for portable CO2 checks, Model D fits battery-powered data logging, Model E-Lite is a connected indoor monitor for homes and classrooms, and Model O adds broader sensing plus USB-C or PoE power for larger deployments. Compare all models side by side.

The VOC index summarizes changing levels of volatile organic compounds from sources like cleaning products, furnishings, and building materials. Higher values usually mean poorer indoor air quality and more need for ventilation. See the VOC guide.

Yes. Compatible models continue measuring and can store data locally, then synchronize readings to the cloud portal after the connection returns. This is useful for classrooms, offices, and remote installations with unstable connectivity. Browse more frequently asked questions.

Air Quality Monitors and CO2 Sensors for Healthier Spaces

Health Protection

24/7 Monitoring

Why Monitor Air Quality?

Respiratory Health

Cognitive Performance

Home & School Safety

The Invisible Threats in Your Air

Carbon Dioxide

Sources:

Health Impact:

Particulate Matter

Types:

Sources:

Volatile Organic Compounds

Sources:

Health Impact:

Our Products

Model C – Smart CO₂ Sensor

Model F – Portable CO₂ Sensor

Model D – Battery-Powered CO₂ Sensor

Model E-Lite: Complete Air Quality Sensor

Model O: Advanced Multi-Sensor Monitor (2026 Edition)

Model X2: Enhanced Exterior Sensor

Buying Guides and Popular Support Topics

Compare Air Quality Monitors

CO2 Sensor Calibration

VOC and TVOC Meaning

Outdoor Sensor Maintenance

VisiblAir Cloud Portal

About VisiblAir

Frequently Asked Air Quality Monitor Questions

How often should the VisiblAir CO2 sensor be calibrated?

Which air quality monitor is best for homes, classrooms, or offices?

What does the TVOC or VOC index mean on VisiblAir sensors?

Do VisiblAir Wi-Fi sensors still work when Wi-Fi is unavailable?

Join Our Air Quality Community

Contact Us