Hi suads,
Based on the information from BME680 datasheet,
CO2 equivalents(ppm): The sensor does not directly measure CO2, but derives this from the average correlation between VOCs and CO2 in human's exhaled breath;
b-VOC equivalents(ppm): The scaling is derived from lab tests with the b-VOC gas mixture described in below table,
The sensor will not directly get the CO2 result, and the concentration of the CO2 is relative to VOCs.
So when customer just light up the candle and blow off the candle, the CO2 concentration was changed, but the VOCs concentration maybe not changed directly.
At same time, customer can monitor the b-VOC result from the sensor.
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