The two most commonly used Nitrox mixtures in recreational diving are?

The two most commonly used Nitrox mixtures in recreational diving are EAN 32 and EAN 36. These mixtures are specifically chosen for their balance of oxygen and nitrogen content, which provides divers with longer bottom times and reduced nitrogen absorption compared to air.

EAN 32, which contains 32% oxygen and 68% nitrogen, is often used for dives that can benefit from a moderate increase in oxygen to extend dive times and decrease the risk of nitrogen narcosis, especially at shallower depths. Similarly, EAN 36 contains 36% oxygen and 64% nitrogen, which further increases the oxygen content, allowing for even longer bottom times at certain depths while minimizing nitrogen exposure.

The popularity of EAN 32 and EAN 36 in recreational diving stems from the increased safety margin they provide concerning no-decompression limits and the reduced risk of decompression sickness. Consequently, these two mixtures are widely regarded as optimal choices for various diving profiles and conditions within recreational diving practices.