Thanks Ciprian. I think there's a massive question as to where the error is coming from, whether it's self-heating, or a software issure, or chip-dependent... and then whether the BSEC air quality values can be trusted. My guess is that they are derived (in part) from temperature and humidity, and are therefore equally inaccurate. From my perspective, the sensor is currently useless. It looks like Arduino provide the warranty. Next week I'll move the discussion over there, and request a refund.
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