Sonoff has announced the launch of two new smart air quality sensors, both designed to go beyond basic temperature and humidity monitoring. The Sonoff AirGuard PM2.5/PM10 Air Quality Monitor is a 4 in 1 device that measures PM2.5, PM10, temperature and humidity, while the Sonoff AirGuard CO₂ Air Quality Monitor is a 3 in 1 option that tracks CO₂ alongside temperature and humidity.
CO₂ monitoring becomes useful very quickly in real world use. As rooms fill with people, CO₂ levels rise, which can lead to that stuffy feeling or reduced concentration. The AirGuard tracks these changes continuously and updates readings quickly, letting you see live changes rather than delayed snapshots. That makes it practical rather than just another sensor collecting data in the background.
The device is designed to sit on a desk or shelf with good airflow to maintain accurate readings, and it uses USB C power for continuous monitoring instead of batteries.
Matter and Apple Home
Because it supports Matter, setup is straightforward and ecosystem neutral. Once added, the sensor appears in Apple Home like any other compatible accessory, allowing you to build automations around air quality. You could trigger a fan, start an air purifier, or simply use the data to know when a room needs fresh air.
For Apple Home users, the SONOFF AirGuard CO₂ is particularly interesting. It is a compact air quality monitor designed to bring real environmental data into Apple Home using Matter over Wi-Fi. Instead of acting as another basic climate sensor, it focuses on monitoring CO₂ levels alongside temperature and humidity, giving you a clearer understanding of what is actually happening inside your home.
Overall, the SONOFF AirGuard range shows how smart homes are starting to move beyond motion sensors and timers and toward environmental automation. With Matter support, useful air quality insights, and pricing that sits at £36.10 / $39.90 / €40.70 for the PM2.5/PM10 model and £45.15 / $49.90 / €50.90 for the CO₂ model. You can pick them up via the company’s store and Amazon.
I have this device and it linked to HomeKit very easily using Matter. My only complaint is that while it makes the air quality data available in HomeKit it does not pass the temperature on although it is displayed on the unit.