Why is it important to avoid using an air regulator with Nitrox?

Using an air regulator with Nitrox is important to avoid because it may not be safe due to potential oxygen contamination. Enriched air, or Nitrox, includes a higher proportion of oxygen than standard air, which can lead to a risk of oxygen toxicity if not used properly. Regular air regulators are designed for a mix of gases that includes 21% oxygen and 79% nitrogen, and they may not be compatible with the higher oxygen levels found in Nitrox mixtures.

When using Nitrox, it is crucial that the equipment, including the regulator, is specifically rated and cleaned for use with higher oxygen concentrations. If standard air regulators are used with Nitrox, there is a risk of contamination from residual oils or other substances that could ignite due to the increased partial pressure of oxygen. This makes using an air regulator with Nitrox potentially hazardous, emphasizing the importance of using equipment that is specifically maintained and labeled for Nitrox use.

The other options do not correctly align with the primary concern of safety related to oxygen toxicity and equipment compatibility.