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A comment on Indoor CO2 may reach levels harmful to cognition by the end of this century. Parent comment

Re:Indoor CO2 may reach levels harmful to cognition by the e... by cosmic_shame on Saturday September 19, 2020 @01:27PM (#24529046)
For portability, you can also hook up to an ESP8266/ESP32 and configure to talk to HomeAssistant via ESPhome: https://esphome.io/components/sensor/mhz19.html
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