Why is oxygen toxicity a critical concern for scuba divers using nitrox?

The concern regarding oxygen toxicity for scuba divers using nitrox primarily arises from the potential for oxygen to become toxic at elevated partial pressures. When divers use nitrox, which has a higher oxygen content than regular air, they are exposed to increased levels of oxygen when they descend to greater depths. As the depth increases, so does the partial pressure of oxygen, leading to the risk of central nervous system (CNS) toxicity and lung oxygen toxicity if the exposure is prolonged or at very high partial pressures.

CNS effects can manifest as seizures, confusion, and visual disturbances, representing serious risks while diving. Additionally, inflammation of the lungs can occur due to high oxygen levels, which may cause damage to lung tissues and increase the risk of developing other complications. Thus, monitoring and managing the depth and duration of dives using nitrox is crucial to avoiding these harmful effects. Understanding these risks helps divers safely enjoy the benefits of using nitrox while mitigating the risks associated with oxygen toxicity.