Sonoff AirGuard CO2 Matter Over Wi-Fi Air Quality Monitor

Smart Indoor Air Quality Monitoring with CO2, Temperature & Humidity Tracking

Know what’s happening in your indoor environment with the SONOFF AirGuard CO2, a Matter-enabled Wi-Fi CO2 monitor designed for accurate, continuous monitoring of CO2, temperature, and humidity.

✔ High-Precision NDIR CO2 Sensor
✔ Matter Over Wi-Fi Support
✔ CO2, Temperature & Humidity Monitoring
✔ 5-Second CO2 Refresh Rate
✔ Up to 365 Days of Historical Data
✔ Smart Air Quality Advice

Designed for bedrooms, home offices, living spaces, classrooms, and modern smart homes.

Built for Smarter Indoor Air Monitoring

You can’t see CO2 levels, and a room doesn’t always tell you when its indoor conditions are changing.

The SONOFF AirGuard CO2 Indoor Air Quality Monitor gives you real-time environmental information in one compact device. Its NDIR CO2 sensor provides responsive readings, while integrated temperature and humidity monitoring gives you a clearer picture of your indoor environment.

Whether you’re monitoring a bedroom overnight, working from home, managing a classroom, or building a connected smart home, AirGuard helps you replace guesswork with useful environmental data.

With Matter over Wi-Fi, historical records, alerts, and smart-home automation support, it’s more than a basic CO2 meter—it’s a connected tool for smarter indoor monitoring.

Why Choose the SONOFF AirGuard CO2?

Choosing an indoor air quality monitor is about more than simply displaying a CO2 number. You want accurate sensing, useful environmental information, reliable connectivity, and features that make the data practical.

AirGuard combines:

High-precision NDIR CO2 sensing for responsive carbon dioxide monitoring

3-in-1 environmental monitoring for CO2, temperature, and humidity

Matter over Wi-Fi connectivity for compatible smart-home ecosystems

Up to 365 days of historical data for tracking long-term environmental patterns

Intelligent air quality advice using indoor readings and local outdoor air information

Smart alerts and automation to help you respond when conditions change

Every feature is designed to make indoor environmental monitoring easier, more connected, and more useful in everyday spaces.

Why AirGuard Compared to Basic CO2 Monitors

The Difference You Notice Immediately

See CO2 Changes in Real Time

The AirGuard uses an NDIR CO2 sensor with an accuracy of approximately ±(50 ppm + 5%) and a 5-second refresh rate. This gives you a responsive view of changing CO2 conditions rather than relying on occasional manual checks.

Monitor More Than CO2

Track CO2, temperature, and humidity from one device. Having these measurements together makes it easier to understand how your indoor environment changes throughout the day.

Connect to Your Smart Home

With Matter over Wi-Fi, AirGuard can integrate with compatible smart-home ecosystems including Apple Home, Google Home, and Amazon Alexa, depending on the supported setup.

Track Long-Term Environmental Patterns

Access up to 365 days of historical data and export records when you want to review changes over time. This makes it easier to identify recurring patterns in your indoor environment.

Get Useful Air Quality Guidance

AirGuard can compare indoor readings with real-time local outdoor air information to provide practical guidance on improving indoor conditions.

Premium Features

How to Use the AirGuard CO2

Using the SONOFF AirGuard CO2 air quality monitor is straightforward:

1. Connect the monitor to USB-C power.

2. Pair it through the eWeLink app or a compatible Matter ecosystem.

3. Place it in the indoor area you want to monitor.

4. Check real-time CO2, temperature, and humidity readings.

5. Set alerts or compatible smart-home scenes when required.

6. Review historical data to understand longer-term environmental patterns.

For Matter-based smart-home integration, a compatible Matter controller/gateway is required.

Who Is It For?

The SONOFF AirGuard CO2 is ideal for:

• Homeowners monitoring everyday indoor conditions

• Smart-home enthusiasts building Matter-compatible automation

• Remote workers monitoring home office environments

• Families wanting greater visibility into indoor conditions

• Classrooms and shared spaces with changing occupancy

• Bedroom users tracking overnight environmental patterns

• Property managers and workspace operators monitoring enclosed areas

• Tech-focused users who want connected environmental data

If you want more than a simple standalone CO2 meter, AirGuard provides the sensing, connectivity, historical data, and automation features needed for a smarter monitoring setup.

Installation & Connectivity

The AirGuard CO2 is designed for continuous indoor monitoring and connects through Wi-Fi for smart functionality. You can manage compatible features through eWeLink or integrate the device with supported Matter ecosystems.

Its compact 103 × 70 × 26 mm design makes it easy to position on a desk, shelf, bedside table, or other suitable indoor surface.

The monitor uses USB Type-C 5V/1A power, making continuous operation simple and convenient.

Important Compatibility Information

A Matter-compatible gateway/controller is required for Matter-based smart-home integration.

Matter compatibility allows the AirGuard CO2 to work with supported smart-home platforms, but available features can vary depending on the ecosystem, controller, and connected devices being used.

Warranty

Warranty coverage is subject to the manufacturer's applicable warranty terms and the seller's conditions of sale.

Please refer to the applicable product warranty documentation for specific coverage, exclusions, and claim requirements.

Specifications

Frequently Asked Questions

What does the SONOFF AirGuard CO2 monitor?

The AirGuard monitors CO2, temperature, and humidity in indoor environments. It uses an NDIR sensor for CO2 measurement and provides responsive readings through its display and connected smart-home ecosystem.

Does SONOFF AirGuard CO2 support Matter?

Yes. The SONOFF AirGuard CO2 supports Matter over Wi-Fi and can connect with compatible smart-home platforms, including supported Apple Home, Google Home, and Amazon Alexa setups.

How quickly does the CO2 reading update?

The CO2 reading refreshes approximately every 5 seconds when the device is continuously powered.

Can I view historical CO2 data?

Yes. AirGuard supports up to 365 days of historical CO2, temperature, and humidity data, allowing you to review longer-term environmental patterns and export records.

Do I need a Matter gateway?

A compatible Matter controller or gateway is required for Matter-based smart-home integration. The device can also be paired through the eWeLink app using its supported setup options.

Take Control of Your Indoor Environment

Stop relying on guesswork to understand what’s happening inside your home or workspace. The SONOFF AirGuard CO2 Matter Over Wi-Fi Air Quality Monitor combines high-precision NDIR CO2 sensing, temperature and humidity monitoring, historical data, intelligent guidance, alerts, and Matter connectivity in one practical device.

Whether you’re monitoring a bedroom, home office, classroom, living area, or connected smart home, AirGuard gives you the information you need to better understand changing indoor conditions.

Ready to upgrade your indoor monitoring? Choose SONOFF AirGuard CO2 and bring smarter, connected air-quality monitoring into your everyday environment.