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Re:CO2meter: A Python interface to USB CO2 monitor devices by Klinky on Thursday April 02, 2020 @07:38PM (#22765005)
Andreas Spiess has a good video on VOC vs CO2 sensors.

https://www.youtube.com/watch?v=FL0L-nic9Vw

Re:CO2meter: A Python interface to USB CO2 monitor devices by Rebelgecko on Friday April 03, 2020 @01:05AM (#22766432)
His channel is a goldmine for anyone who plays around with ESP-32 microcontrollers or similar devices