3 ms·

Almost certainly the effect of combustion of jet fuel - which is not a good proxy for Covid risk of course. This article seems to conflate those two a bit, thou

• jeffbee 4y ago
  Bleed air is taken from the compressors before the combustion section, so it's probably not CO2 from combustion. If it was, it would also be humid and stink of kerosene, which it's not (cabin air is notoriously dry except on the 787) and doesn't (fuel smells in cabins have other causes). CO2 rises in the cabin during taxi because the bleed air system is not effective while the aircraft is moving slowly. This is another good feature of the 787: cabin air conditioning works adequately even with the aircraft at rest.