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Lets not forget Nitrogen isn't the only problem with air at depth.
Has anyone done the math on the depth for O2 convulsions from air?
What depth does this come in to play?
Air has an MOD (as any nitrox mix would) based on whatever partial pressure you chose to apply (1.4 - 1.6 is the norm). Exceeding those limits would bring a higher risk of tox. That said, there have been discussion about the theory that nitrogen exposure may counter-act, to some degree, the physiological impacts of O2 tox, as it counter-balances O2 stimulation with an CNS sedative effect. I haven't had any cause to do deep air diving for quite some time, so it's not something at the top of my list to read up on...
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