I think on a plane you really have to put your faith in the filtration being top notch, because every time I've flown with the Aranet4 CO2 monitor we've never had lower than 1300ppm in the cabin. Not idea air quality at all. And as Knut says on the ground it's worse, pushed numbers over 2000ppm.
Whereas in terminal buildings I've seen nice low readings from 500-700.
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