@electrik said in Quantifying IAQ values of BME680: @nikhil-sukhdev As I read the datasheet, the sensor also provides raw measurements of the gas sensor (5.3.4.4). Perhaps you can use that instead of the compensated IAQ values? I think it's not a good idea. All the interest of the software suite that generates the IAQ is to process nearly meaningless raw values (dependant on temperature, humidity, time the sensor has been running, age of sensor,...) and provide a consistant and understandable value.