Why should divers be cautious of rapid ascents while diving Nitrox?

Divers should be particularly cautious of rapid ascents while diving with Nitrox because of the increased risk of decompression sickness (DCS) due to nitrogen buildup in the body. Nitrox is a gas blend that typically contains a higher percentage of oxygen and a reduced percentage of nitrogen compared to regular air. When divers spend time at depths, nitrogen is absorbed into their bodies under pressure. Ascending too quickly can prevent the nitrogen from being released at a safe rate, leading to bubbles forming in the tissues or bloodstream, which is what causes DCS.

Managing ascent rates is critical for ensuring proper off-gassing of nitrogen—allowing it to safely leave the body. Even though Nitrox reduces the overall amount of nitrogen breathed compared to air, the principles of safe ascent and decompression still apply. Therefore, maintaining a controlled ascent rate is essential to avoid these harmful effects after diving.