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A comment on Airline cabin air quality is worse than before smoking ban (2016). Parent comment

Re:Airline cabin air quality is worse than before smoking ba... by ReGenGen on Friday September 03, 2021 @05:10PM (#28409465)
High CO2 levels is not only a problematic itself but an indicator of poor air circulation. You are breathing in other's expelled air. Catching/ spreading a virus like SARS‑CoV‑2, flu measles is an obvious "ill health" effect.
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