What kind of toxicity is a major concern when using enriched air nitrox?

CNS (central nervous system) oxygen toxicity is a significant concern when using enriched air nitrox, particularly at depths beyond recreational limits. Nitrox has a higher concentration of oxygen compared to regular air, which increases the risk of CNS toxicity when divers exceed certain depth thresholds. The partial pressure of oxygen increases as a diver descends, and at higher partial pressures (generally above 1.4 ATA), the risk of experiencing symptoms, which can include visual disturbances, seizures, and in severe cases, loss of consciousness, becomes much greater.

Understanding this risk is critical for divers using nitrox, as it helps them make informed decisions about their dive plans, including maximum operating depths and the need to monitor their time and depth while diving. Effective training and adherence to established guidelines can help mitigate this risk, ensuring a safer diving experience.