nbsp;A good air monitor needs to be connected to your Wi-Fi to provide continuous measurements. It’s also needs precise sensors, for the right air pollutants.
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Airthings View Plus - Radon & Air Quality Monitor
6 IN 1: Measure PM2.5, PM1.0, TVOC, CO2, Temperature, and Humidity, with a sensitive laser particle sensor, laser TVOC sensor, and accurate NDIR CO2
GZAIR WiFi Air Quality Monitor Detects Carbon Dioxide, PM2.5, 1.0, TVOC, Temperature, and Humidity, IoT Controller with Relay Function, Data Logger