What is the primary reason for using a higher oxygen content in the diving gas mix?

Using a higher oxygen content in the diving gas mix primarily serves to reduce the amount of nitrogen inhaled. When divers use enriched air, which typically contains a higher percentage of oxygen compared to standard air, they decrease their exposure to nitrogen. This is significant because excess nitrogen can contribute to the risk of decompression sickness (often called “the bends”), especially during repetitive dives or when diving at greater depths.

By limiting nitrogen intake, divers can extend their bottom time at certain depths without increasing the risk of nitrogen-related complications. In addition to this safety benefit, several divers appreciate enhanced comfort and clarity during and after a dive, as they can often experience reduced fatigue and a quicker recovery over multiple-day diving excursions.