SSI Specialty Course Enriched Air Nitrox (SC-EAN) 40% Level 2 Practice Test

Enriched air nitrox increases a diver's no-decompression limits compared to regular air. This is primarily due to the higher oxygen content and the lower proportion of nitrogen in nitrox mixtures. When divers use enriched air, they reduce their overall exposure to nitrogen while benefiting from additional oxygen, which can enhance the body’s ability to off-gas nitrogen that has been absorbed during the dive. The increased oxygen concentration in the breathing gas allows divers to typically stay longer at a given depth without having to perform decompression stops. However, it is essential to manage the partial pressures of oxygen carefully, as using nitrox also comes with its own limits to prevent oxygen toxicity, especially at deeper depths. This advantage in no-decompression limits is why enriched air nitrox is a popular choice among divers who wish to extend their bottom time safely. Although the other options may suggest different effects, they do not properly reflect the benefits and considerations associated with using enriched air nitrox in diving.