What is an acceptable level of CO in the cockpit. I have a CO experts Model PG-2017R that indicates exact ppm (parts per million) but I cannot find any information about what are acceptable levels and for what duration. OSHA indicates that no more than 50 ppm for a duration of 8 hours. I fly for much less than 8 hours and the highest reading I've gotten is 45 briefly. AOPA can provide no info on this question and suggested I find an aviation physiologist (any ideas about how I might do that?).
It seems the FAA uses the 50 ppm/8-hour shift numbers, too:
That FAA tech report above also recommends setting your alarm threshold to 35 ppm.
Thanks for the prompt reply and the info. Leaves the question about whether some level of CO is found in all cockpits. I doubt that very many pilots fly with a CO detector that provides readings of ppm (in contrast to the changing color discs).
OSHA says, 50 ppm for Eight hours. But that is on the ground.
I think the OAM's data is more approrpiate, however for low oxygen conditions!
Only time my co detector indicates any co is on the ground depending which way the wind and prop is pushing the exhaust. In flight you should be at zero.