The carbon dioxide sensors available on the market today are calibrated for operation at sea level. As the altitude increases, air density (and the number of carbon dioxide molecules) decreases in accordance with the ideal gas laws. Since the sensor is calibrated at standard barometric pressure it "sees" fewer carbon dioxide molecules at reduced pressures and therefore outputs a signal corresponding to the reduced number of molecules. This signal will indicate a lower carbon dioxide level than is actually present.
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Topics of Interest
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