Awair Element
There’s a lot of options when it comes to air quality monitors, but in our experience the Awair Element is a pretty good device to end up on.
It features pretty accurate temperature, humidity, CO2, TVOC and PM2.5 sensors, has a reasonable app, and has a “local API” you can enable via the app that can be fed directly into Home Assistant (or other home automation platforms.)
Member Tips
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If a sensor does fail, it’s possible to replace them inside the device rather than buy a whole new one.
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Awair Elements were the subject of a weird cryptocurrency at one point and so you can often find good deals on them used.