The thread – & comments – are wild. “Poor air quality has retired pilots”…none that I’ve met “There has always been controversy about how cabin air is generated”…no, we understand it quite well “If the cockpit was as bad as the cabin, those pilots are impaired!”…no, we’re fine, but thanks “I thought CO2 was always going to be high on a flight because there is no fresh air being circulated”…there’s a lot of it, actually, or you’d be dead on the transcon “Another argument for a robust international rail system”…let me know how that works in the Atlantic “I bet the HEPA filters are blocked & not scrubbing the air”…that would be an immediately noticeable problem Once again, the CO2 sensors on airplanes stuff is completely worthless. The most likely explanation is that the instrument isn’t calibrated (31% humidity on an airplane is impossible) and that they’re measuring their own exhalation. Jets have been flying with these systems since the 60’s. If the CO2 was a problem putting pilots & flight crew to sleep – or if flight crews were getting covid at some higher rate (they aren’t) – we’d know. Stop posting this kind of crap. It’s worthless fear-mongering