"Weatherduino" Tag has been added. My CO2 readings are rather high. I think there must be a calibration issue. 700 to 800ppm is rather high (about the same as a CO2 enriched greenhouse) a number in the early 400's is more realistic.
https://www.co2.earth
https://www.scientificamerican.com/artic...d-for-co2/
https://www.co2.earth
https://www.scientificamerican.com/artic...d-for-co2/

