What are the risks associated with breathing oxygen at higher partial pressures?

Breathing oxygen at higher partial pressures can lead to a condition known as oxygen toxicity. This occurs when the partial pressure of oxygen exceeds certain levels, typically around 1.4 ATA (atmospheres absolute) for recreational diving, although the specific threshold can vary depending on individual susceptibility and the duration of exposure.

At elevated partial pressures, the body's tissues can become hyperoxic, leading to detrimental effects primarily on the central nervous system and lungs. Symptoms of oxygen toxicity can include visual disturbances, ringing in the ears, twitching, seizures, and in severe cases can lead to loss of consciousness or other serious complications. The risk of oxygen toxicity increases with both the depth of the dive and the duration of exposure, making it a significant concern for divers utilizing enriched air or diving at greater depths.

Other potential risks associated with diving, such as decompression sickness, nitrogen narcosis, and hypoxia, are relevant in different contexts but do not specifically address the dangers posed by elevated levels of oxygen. Therefore, understanding the implications of oxygen exposure at higher partial pressures is critical for safe diving practices.