What are nitrox I and nitrox II?
Nitrox I and nitrox II are standard nitrox mixes defined by the National Oceanic and Atmospheric Administration (NOAA) in the US. NOAA has been using nitrox since the 1970’s. Nitrox I is defined to be a mix containing 32% oxygen and 68% nitrogen. Nitrox II is defined to be a mix containing 36% oxygen and 64% nitrogen. The tolerance in the oxygen percentage is +/-1%. When the nitrox is made by enriching air with oxygen, the trace gases are included in the percentage nitrogen figure.
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