Originally posted by Baldricks_Mate:
Actually the dialouge is misleading. The meter is correctly named but the result, 50% oxygen, is not entirely accurate in describing the problem. Fresh oxygen from any source will not scrub the Co2 or Co from the air and its the effects of these gases that are the problem. Getting more oxygen is not the problem. The problem is the saturation level of "bad" gases.
Put the air in your car to recirculate and wind up all the windows and go for a long drive, you will be sleepy. Similar problem.
The only fix to to exchange the stale air for fresh. The ability to scrub air was still along way off.