Hi PicoPiedra, Firstly, I would like you to read the following posts: I explained the function of BSEC in a bit more details in this post: https://community.bosch-sensortec.com/t5/MEMS-sensors-forum/BME680-strange-IAQ-and-CO2-values/m-p/9667/highlight/true#M1505 Also make sure to read the following Q&A: https://community.bosch-sensortec.com/t5/Question-and-answers/BSEC-output-selection/qaq-p/9933 OK now that you are back here. The static IAQ as you've learned has a fixed sensitivity scaling, however the the part itself is a chemical sensor that will slowly stabilize over time. We have tuned the sIAQ output to best match the sensitivity we characterized with hundreds of parts using accelerated aging. We have now over 4 years of real-life data in in field to support that claim. Note however that with chemical sensors, the aging will depend on the environment it is exposed to. Back to your use-case. The sensitivity change is most prominent in the early life of the sensor, in the first days or weeks. For LP mode I would recommend to wait 1 week before performing these kinds of tests. In ULP mode, 2 weeks. (the longer the better, all our data suggests that this sensitivity decrease stabilizes over time). As you can probably see from the raw data, humidity impact the raw gas resistance. For rapidly changing environmental conditions, the output is affected by the different time constants of each internal sensor (temp, humidity, gas). Latest BSEC releases include some compensation for this. Question: Is your application really expecting such rapid environmental changes ? I would recommend to test the sensor with a profile that would be expected in the real world, so you do not have to solve problems that do not exist. Always happy to give advice, if you want to share a bit more about your application, we can make recommendations. o_o
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