Hi sciencegirl,
In the picture you provided by you, is it BSEC_OUTPUT_IAQ or BSEC_OUTPUT_STATIC_IAQ?
After opening the window, We are not sure whether the IAQ has become larger because of bad outside air. We recommend you place a BME688 outside the window, and when the window is opened, observe the CO2 and IAQ output of the BME688 inside and outside the window.
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