What should you do if the contents tag shows a limiting ppO2 of more than 1.4 ata?

If the contents tag indicates a limiting partial pressure of oxygen (ppO2) greater than 1.4 ata, the best course of action is to disregard that value and choose a more conservative limit of a maximum of 1.4 ata. This is critical because exceeding a ppO2 of 1.4 ata can lead to an increased risk of oxygen toxicity, which can have serious neurological and physiological effects at depth.

Maintaining a ppO2 of 1.4 ata or below during dives helps to mitigate this risk, ensuring a safer diving experience. The 1.4 ata limit is widely accepted among divers, especially when using enriched air nitrox, because it balances the benefits of increased oxygen with safety considerations.

Using the gas as it is, resuming diving without adjustments, or simply seeking advice without taking immediate action may expose the diver to unnecessary risks associated with higher levels of oxygen. Prioritizing diver safety and adherence to recommended ppO2 limits is essential in preventing diving-related health issues.