This app will show you current CO2 concentration (ppm) and the Index for Air Quality of your environment, and light LEDs accordingly, like a traffic light.
This is not based on anything seriously scientific but it could be taken as a clue you need to ventilate the room.
Based on @schneider's work for presenting BME680 sensors to Epicardium and Pycardium API. Also based on C10VID - Demo for the BSEC air quality sensors
This is a card10 app (CCCamp badge).
bsec_enable = true has to be in your card10.cfg.
You will need to flash firmware >= v1.17 according to the card10 documentation.