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I've more or less standardized on EAN32(-ish) as breathing gas when I dive locally since it's included in the membership fee for my club, as long as you're certified and have received training in operating the mixer. At 30m (my personal depth limit), that's 1.3 bar pPO2.My original training said take 0.1 PO2 for any negative e.g.; stress, cold, work, fatigue, etc, form the 1.6 limit.
When Nitrox was introduced into the BSAC training, the maximum PO2 to be used was 1.4, (1.6 for decompression - ADP). This was an adjustment from the 1.6 (standard limit) because of UK environmental factors; cold water, stress (low visibility), work (tidal waters). Also, it had become standard in Trimix diving to use a PO2 much lower than 1.6 for the bottom phase of the dive.
Interestingly, I would suggest that was a good decision if you look at subsequent norms, like a maximum PO2 of 1.3 on rebreathers.
But then I'm a middle-aged average couch potato who hardly ever sees water temps exceeding 10-15 degrees (C) and sometimes down to 4-5 degrees, so maybe it's a smart decision...