Analyze
Personally verify the oxygen percentage in every cylinder before the dive.
Enriched-air diving, made clear
Plan smarter.
Dive longer.
Understand the gas in your cylinder, manage oxygen exposure, and get more from every dive—without the jargon.
EAN32A common recreational blend32% oxygen · 68% nitrogen
Nitrox, explained
More oxygen.
Less nitrogen.
Different limits.
Nitrox is a breathing gas made from nitrogen and oxygen. In recreational diving, the term usually describes a blend with more oxygen—and therefore less nitrogen—than ordinary air.
Reduced nitrogen exposure can extend no-decompression limits on many dive profiles. But the higher oxygen percentage introduces a shallower maximum operating depth and makes correct analysis, labeling, planning, and computer setup essential.
See the essentials →Label
Record the blend, fill details, analyzer result, and your name according to local practice.
Plan
Calculate maximum operating depth and choose a conservative oxygen exposure limit.
Set
Confirm your dive computer is set for the analyzed mix before entering the water.
Find your path
Connect with the right
training resource.
Nitrox.com does not conduct courses or issue certifications. We help divers find qualified dive shops and instructors around the world.
Certification resource01
Find a Nitrox Instructor
Connect with an independent dive shop or instructor who can teach enriched-air fundamentals, planning, analysis, labeling, and computer setup.
- Recognized instruction
- Hands-on gas analysis
- Local and destination resources
Refresher resource02
Find a Refresher
Locate a qualified dive professional who can help you revisit the skills and decisions that matter before your next enriched-air dive.
- Review MOD and PPO₂
- Refresh analysis workflow
- Check computer settings
Knowledge center
Useful before
every descent.
01What does Nitrox change?+
Nitrox lowers the fraction of nitrogen you breathe, which can increase no-decompression time for a given depth. It also raises oxygen exposure, so your planned depth must remain within the safe operating limit for the analyzed blend.
02What is maximum operating depth?+
Maximum operating depth is the depth at which a chosen oxygen blend reaches a planned partial-pressure limit. Training teaches you how to calculate it and apply a conservative limit.
03Do I need special equipment?+
Requirements depend on blend, equipment, filling method, training-agency standards, and local rules. Follow applicable manufacturer, fill-station, and training guidance.
04Can Nitrox make me less tired?+
Some divers report feeling less fatigued, but this is not a dependable planning benefit. Use Nitrox to manage gas exposure and no-decompression limits.
05Why must I analyze my own cylinder?+
Your depth limit and computer setting depend on the actual oxygen percentage. Personal verification connects the gas you received to the dive you are planning.
Nitrox basics
A clear introduction to terminology, benefits, and responsibilities.
Read overview →Pre-dive checklist
Analyze, label, plan, set, verify—the five checks to repeat.
Review steps →Terms that matter
EAN, FO₂, PPO₂, MOD, CNS, OTU, NDL, and more.
Open glossary →Quick glossary
Speak the
language.
- EAN
- Enriched Air Nitrox
- FO₂
- Fraction of oxygen in the mix
- PPO₂
- Partial pressure of oxygen
- MOD
- Maximum operating depth
- NDL
- No-decompression limit
- CNS
- Central nervous system oxygen exposure
About Nitrox.com
A focused home for enriched-air education.
Nitrox.com is an independent information hub and learning resource for divers who want practical, safety-minded guidance about enriched-air diving.
We do not conduct training or issue certifications. We help make the concepts easier to understand and connect divers with qualified shops and instructors.
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Find information.
Find resources.
Contact us for educational information, help locating a dive shop or instructor, industry collaboration, or advertising opportunities.