Which of the following is a common Nitrox mix used by divers?

The choice of a common Nitrox mix used by divers is the combination of 32% oxygen and 68% nitrogen. This specific mixture is known as EAN32 (Enriched Air Nitrox 32). It is popular among divers because it provides a higher percentage of oxygen than standard air, which contains approximately 21% oxygen and 79% nitrogen.

Using EAN32 allows divers to extend their no-decompression limits, reduce nitrogen absorption, and decrease the risk of nitrogen narcosis at greater depths. The advantages make it a favored option for many recreational divers, especially in situations where longer bottom times are desired without significantly increasing the risk of decompression sickness.

Other mixtures, like 40% oxygen, are indeed used but are more specific to advanced or technical diving due to their higher oxygen content, which requires careful management of exposure to prevent oxygen toxicity. The mix of 30% or 20% oxygen is less common when divers are looking for benefits associated with extended nitrogen limits. Thus, EAN32 stands out as a well-recognized and frequently utilized Nitrox mix in recreational diving.