Carbon monoxide in the cockpit--acceptable levels
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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?). 

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That FAA tech report above also recommends setting your alarm threshold to 35 ppm.

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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).

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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!

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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.

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Richard, why should  you be detecting CO on the ground? Wouldn't this have to be b/c CO is leaking from the exhaust system and shouldn't the exhaust system not leak at all?