What is the maximum partial pressure of oxygen (PO2) recommended for recreational Nitrox divers?

The maximum partial pressure of oxygen (PO2) recommended for recreational Nitrox divers is 1.4 ATA. This limit is established to minimize the risk of oxygen toxicity, which can occur at elevated partial pressures of oxygen, particularly during deeper dives.

At a PO2 above 1.4 ATA, the risk of both central nervous system (CNS) and pulmonary oxygen toxicity increases significantly. Therefore, this threshold is regarded as the safest maximum for recreational diving within the scope of the IANTD guidelines. Staying within this limit allows divers to utilize enriched air effectively while maintaining safety during their dives.

For safe diving practices, it's vital to understand the significance of managing exposure to oxygen and respecting the established limits to ensure a positive diving experience.