--- title: "Enriched Air Nitrox" description: "Understand what you're breathing. Nitrox extends no-deco limits and reduces nitrogen loading, but also raises oxygen partial pressures. Online or in-person. Certification included." canonical: "https://donarundas.com/courses/recreational/enriched-air-nitrox" author: "Donarun Das — TDI Trimix Instructor, KISS Sidewinder CCR Instructor" category: "course/recreational" disclaimer: "Dive theory published by a working instructor for education. It is not medical advice and not a substitute for training. Decompression, gas, and depth decisions belong with your own training, your dive computer, and a dive medical officer." license: "© Donarun Das. Quote with attribution and a link to the canonical URL." --- # Enriched Air Nitrox ## At a glance - **Track:** recreational - **Certifying agency:** PADI - **Duration:** Half day to 1 day - **Taught in:** Maldives, Sri Lanka, and India (scheduled around your travel dates) - **Enquire:** https://donarundas.com/contact ## The most cost-effective upgrade in diving The course gets you extended no-decompression limits, reduced nitrogen loading on repetitive dives, shorter surface intervals on liveaboards, and a genuine understanding of what you're actually breathing. Nitrox is the most cost-effective certification in recreational diving. Most divers who do it wonder why they waited. The catch: it's worth doing properly. Enriched air raises oxygen partial pressures alongside the nitrogen reduction benefit. Getting the most from it, and staying inside safe limits, requires understanding both sides. This course covers both sides properly, not just the clicks-through-eLearning version. ## What's included - PADI Enriched Air Nitrox eLearning or in-person theory session - Gas analysis workshop (analysing your own cylinder) - 1 to 2 Nitrox dives (optional, recommended) - PADI Enriched Air Nitrox certification ## Online or in-person? Both options are available. The theory can be completed entirely via PADI eLearning before you arrive, which frees up the in-water time for gas analysis practice and actual Nitrox dives. If you prefer to do everything face-to-face, an in-person theory session can be arranged. Either way, the gas analysis workshop and dives happen in person. ## Who this is for - Any Open Water certified diver who dives more than once a day - Divers preparing for technical training: enriched air is standard for decompression gases in technical diving, and understanding oxygen exposure starts here - Anyone on a liveaboard who wants to extend their no-deco limits - Divers curious about what "Nitrox" actually means ## Prerequisites - PADI Open Water Diver (or equivalent) ## What you'll learn ### Why Nitrox works Enriched air has more oxygen and less nitrogen than air. Less nitrogen means slower tissue saturation, longer no-decompression limits, and reduced loading across a dive day. The benefit is real and measurable, not marketing. - How enriched air compares to air in terms of no-decompression limits (concrete examples) - Reduced nitrogen loading across a multi-dive day - Shorter minimum surface intervals ### The oxygen side This is the part eLearning courses rush. Nitrox raises oxygen partial pressure, which creates limits that have to be understood and respected. - PPO₂ and maximum operating depth: why EAN32 has a different MOD from EAN36 - CNS oxygen exposure: what the percentage means and how to track it across a dive day - What happens if you exceed limits: CNS oxygen toxicity, why it's serious, and why the limits exist - OTU (oxygen toxicity units) for repetitive dive planning ### Gas analysis You will analyse oxygen percentage in a real cylinder using an oxygen analyser. Not just read about it. - How to use an oxygen analyser correctly - Cylinder labelling and documentation requirements - What to do if a mix is different from what's on the label ### Computer setup - Setting your dive computer for different Nitrox mixes - What the computer tracks and what it doesn't - Managing the computer correctly when switching between air and Nitrox ## Where we train The Maldives, Sri Lanka, and India. Can be combined with almost any other course when scheduling allows. ## What comes next Nitrox is the first step toward understanding gas management. From here: - [Advanced Open Water](https://donarundas.com/courses/recreational/advanced-diver): if you haven't done it yet - [Deep Diving Specialty](https://donarundas.com/courses/recreational/deep-diving-specialty): where proper gas planning really starts - [Tec 40 / Intro to Tech](https://donarundas.com/courses/technical/tec40-intro-to-tech): Nitrox is a prerequisite for technical training ## Frequently asked questions ### What Nitrox mixes does this cover? EAN32 and EAN36 primarily, the two most common recreational mixes. The principles apply to any enriched air mix. Higher oxygen percentages for decompression gas in technical diving are covered in technical programmes. ### Can I do the theory online before I arrive? Yes. PADI eLearning is available and recommended. It frees up in-person time for gas analysis practice and dives. The eLearning link is provided when you register. ### Is Nitrox relevant if I only dive recreationally? Absolutely. Extended no-decompression limits, reduced fatigue on multi-dive days, and shorter surface intervals on a liveaboard are all directly useful. The difference on a 5-day liveaboard is noticeable. ### Is this worth doing as a standalone course, or should I combine it with something? It can be done standalone in half a day to a full day. It's most efficient when combined with another course: Advanced Open Water, Deep Diving, or any of the specialty courses. Just mention this when you enquire. ## Enquire about training [Enquire here](https://donarundas.com/contact?inquiry=enriched-air-nitrox). Donarun responds personally to every enquiry. --- **Source:** [https://donarundas.com/courses/recreational/enriched-air-nitrox](https://donarundas.com/courses/recreational/enriched-air-nitrox) **About the author:** Donarun Das is a TDI Trimix and KISS Sidewinder CCR instructor teaching technical and rebreather diving in the Maldives, Sri Lanka, and India. He holds the deepest verified civilian dive in India (103 m, open-circuit trimix, Lakshadweep, March 2026). Courses: https://donarundas.com/courses — enquiries: https://donarundas.com/contact > Dive theory published by a working instructor for education. It is not medical advice and not a substitute for training. Decompression, gas, and depth decisions belong with your own training, your dive computer, and a dive medical officer. ## Sitemap See the full [sitemap](https://donarundas.com/sitemap.md) for all pages available as Markdown.