Can O3 (ozone) affect measurements of Aranet4 device?
O3 most probably will not directly affect Aranet4 measurement precision as the device has the NDIR sensor for CO2 concentration measurements that works with a narrow beam and narrow wavelength laser which energy is absorbed only by CO2 molecules.
NDIR is not an electrochemical sensor that might suffer from gas cross-contamination effects.
As for chemical reactions then ozone can react with carbon or carbon monoxide creating CO2 and such a reaction would provide a real CO2 level increase in the air that the NDIR sensor will detect.
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