BME680 air quality value

As we know the BME680 sensor provides a Megaohm value for air quality. What actually is this value an measurement of?

The Bosh webpage says “In order to measure air quality for personal wellbeing the gas sensor within the BME680 can detect a broad range of gases such as volatile organic compounds (VOC).”

It seems there is a wide specter of what the sensor can detect and Im curious as to what we are detecting with the Meshtastic values. And if it possible to have a function to give indications in the app as to what gasses/poloutains are beeing detected.

The IAQ is the human readable number.