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+1 for the air quality sensors question. I only found 1 for CO2 levels, and it is not connected. And even that one costed $120.

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Tuya Zigbee air quality sensors on AliExpress start around $20. I can't speak to their accuracy, but they are supported by Zigbee2MQTT and provide a CO2 reading.

https://www.zigbee2mqtt.io/devices/TS0601_air_quality_sensor...

Answered here: https://partofthething.com/thoughts/weather-and-air-quality-...

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