Hi jordan982, thank you for the temperature offset hint. Will try to include this once I have some time left. To be honest, I do not care about the IAQ accuracy higher than 1, which is OK for me. I'm running since months with that. The sensor does work well and the calculated values are OK-ish. I did a cross check with a MQ135 sensor and the valaues were in the same range. Please be aware, that the values provided are not what you will get, if you do a proper gas analysis. There is a reason why gas spectrometers still cost a lot. In fact, I just use the numbers to see if the values are "high" or " low" compared to the "fresh-air" values of this set-up or to see if they change at certain times of the day. Cheers
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