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When diving with Enriched Air Nitrox, we extend our bottom time — but we also increase our exposure to oxygen. Understanding oxygen limits isn’t just theory from the Nitrox course — it’s critical for safe dive planning. Let’s break it down. What Is CNS Oxygen Toxicity? CNS (Central Nervous System) oxygen toxicity occurs when a diver is exposed to elevated partial pressures of oxygen (PO₂) for too long. The primary concern?A sudden convulsion underwater. This is why we respect