3 ms·

How would this be true for planes? They're constantly being fed fresh air from the engines during flight.

• uranium 3y ago
  I carried a CO2 meter on a flight recently, to use CO2 as a proxy for COVID risk. The levels were quite high for the whole flight--over 1000 pretty much the whole time iirc and worse on the tarmac.
  • c0pium 3y ago
    How did you calibrate the meter for the changing temperature and pressure? Most CO2 meter designs are extremely sensitive to pressure changes.
    • uranium 3y ago
      It's a cheap portable, with no calibration possible. I have no idea what effect pressure would have on it, unfortunately.
• pc86 3y ago
  It's true for every other mode of transport but objectively false for planes in flight. However, I'd be curious to see the average when including time sitting on the ground, taxiing, etc., and how that much lower speed affects circulation.
  • binoct 3y ago
    The refreshed air in the cabin is driven by engine bleed air (or a dedicated pressure pump) so even at idle power there is nothing preventing a high rate of cabin air exchange. There might still be less air flowing on the ground due to 0 cabin air pressure differential, but speed of the plane isn't a relevant factor.