How does using EANx affect surface interval times?

Using Enriched Air Nitrox (EANx) affects surface intervals primarily because of its lower nitrogen content compared to regular air. When divers use EANx, they reduce the amount of nitrogen absorbed during their dives. This decreased nitrogen absorption means that, upon surfacing, divers may have a lower residual nitrogen load, effectively allowing them to have shorter surface intervals between dives if they are within safe diving practices and planning.

The use of EANx shifts the dive profile and reduces nitrogen narcosis risks, and divers can repeat dives more quickly after using EANx blends. However, it is essential for divers to utilize dive tables or dive computers that are specifically designed for Nitrox to accurately plan their dives and understand their limits regarding surface intervals.

Other options do not accurately reflect the effects of using EANx. While there are guidelines to follow for nitrogen loading and off-gassing, the use of EANx does not typically warrant no effect nor does it mandate a specific surface interval duration. The understanding that using EANx can potentially lead to shorter intervals facilitates better dive planning and nitrogen management for divers.