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What is EAN?

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Photo of a scuba diver preparing to dive with EAN tanks in a sidemount configuration.

A scuba diver prepares to dive with EAN tanks in a sidemount configuration.

Image copyright istockphoto.com, dstephens
Question: What is EAN?
Answer:

EAN (or EANx) is an abbreviation for enriched air nitrox, a mixture of oxygen and nitrogen used as a breathing gas in in scuba diving. EAN contains only nitrogen and oxygen. any other gasses are only present in trace amounts. The term "EAN" specifically denotes a gas mixture that has a higher percentage of oxygen than normal air (more than 21% oxygen); it is essentially air that has been "enriched" with additional oxygen. While EAN may contain any percentage of oxygen greater than 21%, the most common mixtures are EAN 32 (NOAA Nitrox I) and EAN 36 (NOAA Nitrox II) which are have 32% and 36% oxygen respectively. Special training and certification and required to dive with EAN.

EAN FAQs
• Why Dive With Nitrox?
• 7 Risks and Limitations of Diving With Enriched Air Nitrox
• What Is Nitrox?
• What Is Enriched Air Nitrox?
• What Is NOAA Nitrox I?

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