Editing Nitrox (section)

==Uses==
[[File:Nitrox tables.JPG|right|thumb|300px|Enriched Air Nitrox diving tables, showing adjusted no-decompression times.]]

===Underwater diving===
{{Main|Underwater diving}}
Enriched Air Nitrox{{r|EANx}}, nitrox with an oxygen content above 21%, is mainly used in [[scuba diving]] to reduce the proportion of nitrogen in the breathing gas mixture. The main benefit is reduced decompression risk.<ref name="Lang 2006" /> To a considerably lesser extent it is also used in surface supplied diving, where the logistics are relatively complex, similar to the use of other diving gas mixtures like [[heliox]] and [[Trimix (breathing gas)|trimix]].

====Training and certification====
<!-- target for redirect [[Nitrox diver]], [[Advanced nitrox diver]], [[Recreational nitrox]] -->
{{visible anchor|Recreational nitrox certification}} (Nitrox diver) allows the diver to use a single nitrox gas mixture with 40% or less oxygen by volume on a dive without obligatory decompression. The reason for using nitrox on this type of dive profile can be to extend the [[no-decompression limit]], and for shorter dives, to reduce the [[decompression stress]]. The course is short, with a theory module on the risks of oxygen toxicity and the calculation of maximum operating depth, and a practical module of generally two dives using nitrox. It is one of the most popular further training programmes for entry level divers as it makes longer dives possible at a large number of popular sites. Gases suitable for this application may be referred to as recreational nitrox.

Advanced nitrox certification ({{visible anchor|Advanced nitrox diver}}) requires competence to carry two nitrox mixtures in separate scuba sets, and to use the richer mix for accelerated decompression at the end of the dive, switching gases underwater at the correct planned depth and selecting the new gas on the dive computer if one is carried. For the purposes of the certification any mixture from air to nominally 100% oxygen may be used, though at least one agency prefers to limit oxygen fraction to 80% as they consider this has a lower risk for acute oxygen toxicity.

===Therapeutic recompression===
{{Further|Hyperbaric treatment schedules|Therapeutic recompression}}
Nitrox50 is used as one of the options in the first stages of therapeutic recompression using the [[Comex therapeutic table CX 30]] for treatment of vestibular or general decompression sickness. Nitrox is breathed at 30&nbsp;[[msw]] and 24&nbsp;msw and the ascents from these depths to the next stop. At 18 m the gas is switched to oxygen for the rest of the treatment.<ref name="Treatment tables"/>

===Medicine, mountaineering and unpressurised aircraft===
The use of oxygen at high altitudes or as [[oxygen therapy]] may be as supplementary oxygen, added to the inspired air, which would technically be a use of nitrox, blended on site, but this is not normally referred to as such, as the gas provided for the purpose is oxygen.