Fun fact, the air quality on aeroplanes got worse after they banned smoking, because they could cut costs by re-circulating the same air for longer.
replyAir isn’t recirculated on an airplane. It’s continually brought in from outside the aircraft
reply50% is recirculated, 50% is from the outside. Before the 80's it was 100% from the outside, though.
replyThat statistic doesn’t mean much.
replyThe question is how long does it take for all the air in the plane to be replaced.
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