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I really like this. Did you investigate the options regarding CO2 sensors? I'm interested to know if you compared SCD30 to SCD41? The dual-channel design of SCD30 is supposed to offer lower drift and longer stability compared to the SCD41 (which claims to need taking outside once a week). That's the deal on paper, I'm wondering if you got any real data on this.

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Thanks! The SCD30 is a great sensor and obviously better than the SCD41. But we did not look at it in more detail, as we chose the SCD41 primarily for its small size. We believe that an accuracy of +/-50ppm is enough for a device like the Air Lab. Also, we'll actively look into reminding the user to take the device outside if automatic calibration is used. On top of that, it's our plan to either factory calibrate the devices and/or offer manual recalibration that should extend beyond the 1-week interval with automatic calibration.

Maybe contact Sensirion about the STCC4, better form factor and due for release any moment...They have a contact sales option and are usually helpful. https://sensirion.com/products/catalog/STCC4 (Not sure but thought maybe used in the SEN66 which is available now and covers most things including PPM/CO2/VOC/NOx)

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