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500m per night is the ascent limit above 3,000m — the 7 rules that cut AMS risk, covering hydration, Diamox timing, and SpO₂ checks, per WMS 2024.
1 in 4 climbers who ascend fast above 2,500m gets AMS — symptoms, the Lake Louise score, prevention rules, and descent thresholds, per WMS and UIAA.
