Initially, the accuracy of the measurement is the first thing that impresses you. It's not one of those gadgets that show constant values and don't react to anything. If you light a cigarette, cook something that produces even a little smoke, or simply open the window and dust comes in, the AirGuard detects it immediately. The response speed is its big advantage. You see the numbers for PM2.5 and PM10 rise in real time, which gives you a very clear picture of what exactly is happening around you at that moment.

Another big advantage is its compatibility with the Matter protocol, which means that connecting it to your entire smart home ecosystem is seamless and extremely stable. Because I don't like relying on ready-made, limited apps, I've fully integrated it into Home Assistant. You can pull all the data locally and set up your own advanced automations that don't make mistakes. Personally, I've connected it to my home's air purifier: as soon as the sensor detects that PM2.5 levels exceed a limit I've set, it sends a command to the purifier to run at 100% until the air is clean, and as soon as the pollutants drop, it automatically switches it to silent mode. It's so stable in its operation that I've never had to deal with it again after setting it up. It doesn't freeze, it doesn't lose connection, and you have the ultimate "set it and forget it" system.

In conclusion, if you're looking for something to "see" what you're breathing and take control of the situation, don't waste your money on cheap solutions. The AirGuard is worth every euro, it's honest, it does exactly what it promises, and it does it in a way that never gives you trouble. For anyone who wants peace of mind and to know that their environment is being properly monitored, it's the number one choice without a second thought.

I received it the next day. The quality seems good. It connected easily to eWeLink, Google Home and HomeAssistant. It comes with a 2 m USB-C cable.

The temperature and humidity readings were initially way off, but after about 8 hours of operation they started showing values that were consistent with other sensors. The PM2.5 and PM10 readings remained stuck at 0. After monitoring and logging through HomeAssistant, it showed a slight increase around midnight. Ultimately, indoors, outside the city center, the readings may be so low that it doesn’t register them. To make sure the device is working, light a candle and blow it out so that it produces a little smoke. Hold the device over the smoke and it should show a reading within a few seconds. You should also hear the audio alarm.

These devices typically have a little fan that blows air over the sensors. You can’t hear it at all unless you put the device to your ear. At this price, I would expect it to also have TVOC or CO2 detection, but it doesn’t. Full functionality and features are available through the eWeLink app and HomeAssistant, where you’ll get better statistics tracking if you want. Google Home simply shows current readings. The screen isn’t backlit and displays the current readings, temperature, humidity, Wi-Fi connection, audio signal activation, but only one of the PM readings at a time. To see the other one, you have to press two buttons 6 times in total, and as many times again to switch it back....