Nitrox is a breathing gas that has a lot of benefits for both new and experienced divers. This course will cover the use of nitrox mixtures from 22 to 40 percent oxygen. scuba diving with enriched air nitrox gives you more no decompression time, especially on repetitive scuba dives. If staying down longer and getting back in the water sooner sounds appealing, then don’t hesitate to become an enriched air nitrox diver. You’ll learn why diving with air that has higher oxygen and lower nitrogen content gives you more bottom time, along with enriched air equipment considerations.