How does planning nitrox dives differ from planning air dives?

Planning nitrox dives necessitates careful management of exposure to oxygen because nitrox blends contain a higher percentage of oxygen than regular air, which is composed of approximately 21% oxygen. The increased oxygen content in nitrox can lead to oxygen toxicity if divers exceed their maximum operating depth, which is determined by the percentage of oxygen in the mix.

When planning a dive with nitrox, divers must calculate their specific Maximum Operating Depth (MOD) and monitor their oxygen exposure throughout the dive. This consideration is crucial for ensuring safe diving practices and preventing health risks associated with oxygen toxicity. Additionally, divers must consider their exposure over multiple dives, making careful calculations to avoid exceeding safe limits.

While the other options mention aspects that pertain to dive planning, they do not address the distinct focus on managing oxygen exposure that is unique to nitrox diving. Hence, acknowledging the necessity to monitor and manage oxygen exposure is paramount when comparing nitrox dive planning to that of air dives.