What kind of tank markings indicate a tank is filled with Nitrox?

The indication that a tank is filled with Nitrox often involves the use of specific green and yellow stickers or labels. These markings serve a crucial purpose in ensuring safety among divers. The use of green typically signifies a blend of oxygen and nitrogen, while yellow highlights the presence of enriched air. Clear and consistent labeling helps divers quickly identify the gas they will be breathing, minimizing the risk of confusion with other gas mixtures.

When divers encounter tanks labeled in this specific manner, they can trust that the contents meet the safety standards and mixture ratios associated with Nitrox, which generally contains a higher percentage of oxygen than regular air. This is critical because breathing gases with varying oxygen levels necessitates different dive profiles and safety protocols, particularly concerning oxygen toxicity and decompression limits.

The other options do not represent standard or universally recognized indicators for Nitrox tanks and may lead to miscommunication or unsafe diving practices. Standardizing these markings helps to create a safer diving environment.