What is the recommended maximum PPO2 for recreational diving?

The recommended maximum partial pressure of oxygen (PPO2) for recreational diving is 1.4 ATA. This value is established to minimize the risks associated with oxygen toxicity, particularly during the descent and while on the dive. At 1.4 ATA, divers can comfortably enjoy the benefits of enriched air nitrox without significantly increasing the risk of experiencing central nervous system toxicity.

This maximum PPO2 helps ensure a safety margin for recreational divers, allowing them to dive deeper while maintaining an acceptable level of exposure to elevated oxygen levels. While a PPO2 of 1.6 ATA is permissible for very limited exposure, it is mostly reserved for specific circumstances and more technical diving practices, which is why 1.4 ATA is favored in recreational settings.

By adhering to this guideline, divers can enhance their safety and enjoyment while minimizing the potential for dangerous side effects from prolonged exposure to higher oxygen levels.