What is the term for the maximum partial pressure of oxygen considered safe during dives?

The term for the maximum partial pressure of oxygen considered safe during dives is termed the "Oxygen exposure limit." This limit is established to minimize the risk of oxygen toxicity, which can occur when divers breathe air with an oxygen partial pressure exceeding safe levels.

During diving with Nitrox, it’s crucial to manage the partial pressure of oxygen because it directly correlates with the risk of both neurological and pulmonary oxygen toxicity. The commonly accepted safe limit for oxygen partial pressure is typically around 1.4 ATA (atmospheres absolute) for recreational diving. Exceeding this pressure can lead to adverse physiological effects, including seizures or lung damage, depending on the duration of exposure and the specific conditions of the dive.

Understanding this concept helps divers make informed decisions when planning their dives and selecting the right gas mixtures, ensuring they remain within safe operational limits and can enjoy their dives without undue risk.