Sorry to revive this old post but it is the best info I have found on this topic so far. I have been using the slightly newer BME688 and have this same calibration issue. If I turn the sensor on in the office I'm in, it normally sits just above 50 IAQ. However if I turn the sensor on outside for 10mins it gets a baseline of good air quality, so when I bring it back inside it goes up towards 150 IAQ. It seems the calibration depends on the extremes that the sensor sees to determined the IAQ value, it can't tell if the air is bad if it hasn't seen other quality levels. Is there a way to load a profile of captured data as the baseline calibration, so it knows what is good and bad when it loads, so it doesn't need to be shown the extremes each time it is restarted? "I will check with our experts and get back to you" I'm hoping 3.5 years is enough time to get more information hahaha. Thank you for your help.
... View more