Staying within a ppO2 limit of 1.4 ata prevents nitrox divers from experiencing:

Staying within a partial pressure of oxygen (ppO2) limit of 1.4 ata is primarily focused on preventing oxygen toxicity. Oxygen toxicity can occur when the ppO2 exceeds certain thresholds, leading to various physiological effects that can be dangerous, particularly at greater depths where the partial pressure of oxygen increases due to increased ambient pressure.

Oxygen toxicity can manifest in different ways, including central nervous system effects, which can lead to seizures and other neurological symptoms that can be life-threatening while diving. By maintaining the ppO2 at or below 1.4 ata, divers limit the risk of these adverse effects, ensuring a safer diving experience.

It's important to note that while maintaining a proper ppO2 is crucial for managing oxygen toxicity, other diving risks, such as nitrogen narcosis, decompression sickness, and carbon dioxide poisoning, are influenced by different factors or conditions. For example, nitrogen narcosis is more closely tied to the depth of the dive and the partial pressure of nitrogen rather than the level of oxygen. Understanding these parameters helps divers plan their dives more effectively while managing the risks associated with various gases present in diving.