In what year did NAUI sanction enriched air nitrox training?

The year NAUI sanctioned enriched air nitrox training was 1992. This was a significant milestone in diving education, as it formally recognized nitrox as an important subject for divers who wanted to extend their bottom times and reduce nitrogen absorption during dives. By creating training standards and curriculum, NAUI helped to ensure that divers were equipped with the necessary knowledge about the benefits and risks of using nitrox blends in diving. This decision also aligned with advancements in diving technology and increased interest in safer diving practices, promoting better health and safety in the diving community.

The other years do not align with the formal sanctioning by NAUI for enriched air nitrox training.