What is the recommended limiting ppO2 for recreational nitrox dives?

The recommended limiting partial pressure of oxygen (ppO2) for recreational nitrox dives is set at 1.4 ata. This level is considered safe for the majority of recreational diving activities. Maintaining a maximum ppO2 of 1.4 ata helps to mitigate the risks associated with oxygen toxicity, which can occur when divers are exposed to higher levels for extended periods. This limit provides a balance between enjoying the benefits of enriched air, such as extended bottom times and reduced nitrogen absorption, while still prioritizing diver safety.

Higher limits, such as 1.6 ata, are generally reserved for more technical diving scenarios, which involve greater risks and require more stringent planning and management. By keeping the ppO2 limit at 1.4 ata, recreational divers can maximize safety while taking advantage of the advantages that nitrox offers.