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Apologies, I specified "filtration" but meant "quality", which I would define as filtration + fresh air intake.

I'd have expected a better mix (more fresh air) since even with filtration removing many particulates and viruses, high CO2 levels still cause worse cognitive performance.

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It's hard to get lots of fresh air into a pressurized plane, so I'm willing to have a good bit of leeway on that front. And airflow patterns are important; a lot of fresh air running from front to back would likely do more harm than good.

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