What is the primary goal of using enriched air in recreational diving?

The primary goal of using enriched air, also known as Nitrox, in recreational diving is to extend no-decompression limits. This is accomplished because enriched air contains a higher percentage of oxygen compared to standard air, which typically has around 21% oxygen. By increasing the oxygen content (e.g., to 32% or 36%), divers are able to decrease the amount of nitrogen in the gas mixture. This reduction in nitrogen helps to lessen nitrogen absorption into the body during the dive.

As a result, divers can spend more time at certain depths without needing to perform a decompression stop during their ascent. This is beneficial for enhancing dive profiles, allowing for longer bottom times and the opportunity to explore dive sites more thoroughly without the increased risk of decompression sickness that can occur with higher nitrogen levels.

While reducing weight, improving fitness, and eliminating safety stops are relevant considerations in diving, they do not align with the primary benefit of enriched air, which is the ability to allow for extended no-decompression limits, thus maximizing the efficiency and enjoyment of the dive.