What is the primary goal of using enriched air nitrox (EANx) in diving?

The primary goal of using enriched air nitrox (EANx) in diving is to allow longer bottom times. By increasing the percentage of oxygen in the gas mix (compared to regular air), divers can extend their no-decompression limits. This is particularly beneficial for divers who want to maximize their time at depth while minimizing the risks associated with nitrogen saturation and decompression sickness.

While reducing oxygen exposure at depths is relevant since higher oxygen percentages can lead to toxicity at certain depths, it is not the primary reason for using EANx. Eliminating the need for dive planning is not a valid concept in diving; all dives require thorough planning to ensure safety. Enhanced buoyancy control is not a direct result of using EANx either, as buoyancy control primarily depends on the diver’s equipment and technique rather than the gas mixture being used. Hence, the correct focus on longer bottom times highlights the significant advantage that EANx provides to divers.