What is the primary advantage of using nitrox in terms of dive safety?

The primary advantage of using nitrox, particularly a blend that is around 32% to 36% oxygen, is that it reduces the risk of decompression sickness (DCS). When divers use nitrox, they breathe a gas with a higher oxygen content and lower nitrogen content compared to standard air, which is about 79% nitrogen and 21% oxygen.

By lowering the proportion of nitrogen, which is the gas primarily responsible for DCS, divers minimize their exposure to nitrogen absorption during their dives. This results in less nitrogen loading in the body, particularly at shallower depths where most recreational diving occurs. As a result, divers can experience less risk of developing DCS when ascending from these depths.

While divers can enjoy extended bottom times when using nitrox, particularly on shallow dives, the actual depth limits of nitrox blends are determined by both the oxygen and nitrogen content, making careful planning and management essential for safe diving. Thus, the use of nitrox significantly enhances dive safety by reducing the likelihood of dangerous nitrogen saturation, directly affecting the diver's overall risk of decompression illness.