At what depth does the risk of oxygen toxicity generally increase?

The risk of oxygen toxicity generally increases above 30 meters (100 feet) of seawater. At depths greater than this, the partial pressure of oxygen in the breathing gas increases significantly, heightening the risk of central nervous system (CNS) oxygen toxicity. This condition can result in symptoms such as visual disturbances, nausea, seizures, and loss of consciousness, which can be dangerous for divers.

While oxygen toxicity can technically occur at shallower depths, it is particularly pronounced after the 30-meter mark, making divers more susceptible as they descend further. Therefore, understanding the implications of depth on oxygen levels is crucial for safe diving practices.