bme688 BSEC IAQ is an average of all the pollutants or it is specific to one pollutant

[akash_reby]

BSEC IAQ takes into account which gases/pollutants ? 

Has the sensor been calibrated with an reference device? What is the reference device used for callibration ?

[BSTRobin]

Hi akash_reby,

BME688 gas sensor can detect Volatile Organic Compounds (VOCs), volatile sulfur compounds (VSCs) and other gases such as carbon monoxide and hydrogen in the part per billion (ppb) range.

The IAQ of BME688 uses 15ppm BVOCs as IAQ250 and 0.5ppm as IAQ25 in accordance with the recommendations of the German Ministry of environmental protection (15ppm VOCs will cause discomfort), fitting the corresponding relationship between IAQ and BVOC.