What does a diver need to monitor during a Nitrox dive in relation to oxygen exposure?

Monitoring the partial pressure of oxygen is crucial during a Nitrox dive because it directly relates to the risk of oxygen toxicity. Each specific mix of Nitrox has a determined maximum operating depth based on the partial pressure of oxygen in the breathing gas. This partial pressure increases as a diver descends, and if it exceeds safe limits (typically around 1.4 atm for recreational dives), it can lead to serious health risks such as convulsions, disorientation, or even loss of consciousness.

Understanding and keeping track of the partial pressure helps divers plan their dives safely and make appropriate adjustments based on the depth and the type of Nitrox they are using. This is essential for ensuring a safe diving experience and preventing oxygen toxicity.

While current bottom time, water temperature, and other divers' behaviors are important to monitor for overall safety and dive management, they are not as critical in relation to the specific risks posed by oxygen exposure during a Nitrox dive.