PADI Enriched Air Diver 2025 – 400 Free Practice Questions to Pass the Exam

The maximum oxygen partial pressure allowed for recreational diving with enriched air is 1.4. This limit is established to minimize the risk of oxygen toxicity, which can occur when divers are exposed to elevated levels of oxygen over certain pressures and durations.

When diving with enriched air, divers often breathe a mixture with a higher concentration of oxygen than regular air. The partial pressure of oxygen increases with depth, which is why it is crucial to keep it below the threshold of 1.4 ATM while diving. Exceeding this level can lead to symptoms of oxygen toxicity, such as visual disturbances, dizziness, and convulsions, which are dangerous underwater and could lead to life-threatening situations.

Staying within this limit allows for safer diving practices while maximizing the benefits of enriched air, such as reduced nitrogen absorption and extended bottom times, without significantly increasing the risk of oxygen-related issues. The other values exceed the established limits for recreational diving, thereby raising the potential for toxicity and safety hazards.