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Typical scuba air is grade 'E', which allows 500 PPM CO2.  The State
of Florida, for example, only certifies grade E scuba air to 125 feet.
The lower limit for workplace breathing air is 800 ppm.

Shops with 'extra clean' or 'double filtered' air, which they use to
make Nitrox or mix, typically only worry about oil and particulates,
which get held to less than 1 ppm.

500 ppm is .0005 of the total volume, or .0005 atmospheres partial
pressure. 

At, say, 200 feet, this is .00353 atmospheres partial pressure.

At what point does the partial pressure of CO2 become a problem?
Should we be worrying about getting the CO2 out of air for deep air
dives?  Is this a case where partial pressure matters, or is it total
amount, or is it relative to the amount of O2?

-- 
Nick Simicich - njs%scifi.uucp@uu*.uu*.ne* - njs@bc*.vn*.ib*.co*

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