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SONOFF AirGuard CO2 Matter Over Wi-Fi Air Quality Monitor – SAWF-08P Smart Indoor CO2 Monitor with Temperature & Humidity Tracking

Know What’s Happening Inside Your Home

Monitor indoor CO2, temperature, and humidity with the SONOFF AirGuard CO2, a Matter-enabled Wi-Fi air quality monitor designed for modern homes, offices, bedrooms, classrooms, and smart-home environments.

✔ 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
✔ App, Sound & Indicator-Light Alerts

Designed for homeowners, smart-home enthusiasts, remote workers, families, classrooms, and anyone who wants clearer visibility into changing indoor conditions.

Built for Smarter Indoor Air Monitoring

You can’t see changing CO2 levels, and a room does not always make it obvious when indoor conditions are changing.

The SONOFF AirGuard CO2 Indoor Air Quality Monitor gives you real-time environmental information from one compact device. Its NDIR CO2 sensor provides responsive measurements, while temperature and humidity monitoring gives you a broader view of your indoor environment.

Whether you are monitoring a bedroom, home office, living area, classroom, or connected smart home, AirGuard helps replace guesswork with useful environmental data.

With Matter over Wi-Fi, historical data, alerts, and smart-home automation support, AirGuard is more than a basic CO2 meter—it is a connected solution for modern indoor air monitoring.

Why Choose the SONOFF AirGuard CO2?

Choosing an indoor air quality monitor is about more than displaying a CO2 number. You need responsive sensing, useful environmental information, smart connectivity, and features that make your readings practical.

AirGuard combines:

High-precision NDIR CO2 sensing for responsive carbon dioxide monitoring

3-in-1 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 environmental patterns

Air quality advice based on indoor readings and local outdoor conditions

App, sound, and indicator-light alerts for changing conditions

Smart-home automation support for compatible Matter setups

Every feature is designed to make indoor air quality monitoring easier, more connected, and more useful.

Why AirGuard Compared to Basic CO2 Monitors

The Difference You Notice Immediately

 Monitor CO2 in Real Time

AirGuard uses an NDIR CO2 sensor with an accuracy of ±(50 ppm + 5%) and refreshes CO2 readings every 5 seconds when continuously powered. This provides a responsive view of changing indoor CO2 conditions.

 Track Temperature & Humidity Too

Monitor CO2, temperature, and humidity from one device, giving you a more complete picture of your indoor environment throughout the day.

 Connect to Your Smart Home

Matter over Wi-Fi allows AirGuard to integrate with compatible ecosystems including Apple Home, Google Home, and Amazon Alexa. A compatible Matter controller or gateway is required for Matter-based integration.

 Understand Long-Term Environmental Patterns

Access and export up to 365 days of historical CO2, temperature, and humidity data, making it easier to identify recurring changes over time.

 Get Practical Air Quality Guidance

AirGuard can combine indoor CO2 readings with local outdoor air information to provide guidance for 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 Type-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. Configure alerts or compatible smart-home scenes as required.

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

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

Who Is It For?

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

• Smart-home users who want connected environmental data

If you want more than a simple standalone CO2 meter, AirGuard combines real-time sensing, smart connectivity, historical data, alerts, and automation support in one compact monitor.

Installation & Connectivity

The SONOFF AirGuard CO2 is designed for continuous indoor monitoring and connects through 2.4 GHz 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 for continuous operation. The rear air vents are used for gas detection, so the device should not be mounted directly against a wall where airflow could be restricted.

Important Compatibility Information

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

AirGuard supports Matter over Wi-Fi and can work with compatible platforms such as Apple Home, Google Home, and Amazon Alexa. Available features can vary depending on the smart-home ecosystem, controller, and connected devices.

Warranty

All Dialedin products carry a 12-month warranty against manufacturing defects and failure, excluding consumables. Warranty coverage is subject to the seller’s applicable warranty terms and conditions.

Specifications

Frequently Asked Questions

What does the SONOFF AirGuard CO2 monitor?

The AirGuard monitors CO2, temperature, and humidity in indoor environments using an NDIR CO2 sensor and displays the information directly on the device and through compatible smart-home platforms.

Does SONOFF AirGuard CO2 support Matter?

Yes. AirGuard supports Matter over Wi-Fi and can integrate 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 can store up to 365 days of historical CO2, temperature, and humidity data, with support for exporting records.

Do I need a Matter gateway?

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

Can the AirGuard CO2 be wall-mounted?

The manufacturer advises against mounting it directly against a wall because the rear air vents are used for gas detection and restricted airflow can affect measurement accuracy.

Take Control of Your Indoor Environment

Stop relying on guesswork to understand what is happening inside your home or workspace. The SONOFF AirGuard CO2 Matter Over Wi-Fi Air Quality Monitor combines NDIR CO2 sensing, temperature and humidity monitoring, rapid 5-second updates, historical data, smart alerts, air quality guidance, and Matter connectivity in one practical device.

Whether you are monitoring a bedroom, home office, classroom, living space, or connected smart home, AirGuard gives you clear environmental data and the smart-home connectivity to put that information to practical use.

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