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Nick, Carbon dioxide is limited by it's partial pressure, but most people can adjust to partial pressures of less than 3% fairly easily (ie, increase minute ventilation to controll the arterial carbon dioxide partial pressures). Thus, grade E air should be very service able down to 600+ ft based on its carbon dioxide content (however, carbon dioxide would definitely be a problem at 600ft on air, not due to the intrinsic carbon dioxide level, but due to carbon dioxide accumulation due to the increased density of the breathing mixture and thus the increased workload required to move this gas in and out of the lungs). Thus, carbon dioxide in the air used for diving (or for mixing) is probably not a major concern in the technical diving field, as the diver will very rarely (if ever) inhale a mix with more than 0.5% carbon dioxide. Another point is the carbon monoxide levels. I will make a statement and see what kind of comments we receive here... "Talking about carbon monoxide, if a breathing mix is safe to breathe at the surface (re: it's carbon monoxide level), then it will be safe to breathe at any viable depth based on its other parameters." Think about it! John Submariner Research, Ltd. (johncrea@de*.co*)
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