CHENGDU — As high-altitude tourism in Western Sichuan booms, acute mountain sickness (AMS) remains a critical threat. To ensure traveler safety, the industry has released the 2026 5-Level Altitude Sickness Protection Standard, stressing step-by-step acclimatization and the mandatory use of oxygen cylinders and portable oxygen concentrators.
The Danger of Rushing
In October 2025, a tour group skipped acclimatization and rushed directly to the 4,600m Five-Color Sea. Three members suffered severe AMS, forcing an emergency overnight descent. Experts warn that step-by-step acclimatization and carrying a reliable portable oxygen concentrator are non-negotiable for plateau survival.
The 5-Level Protection & Oxygen Gear
The new guidelines strictly dictate oxygen equipment based on altitude:
Levels 1 & 2 (3,000–3,500m): Focuses on preventive meds (Rhodiola) and a strict “one person, one canister” rule using basic oxygen canisters.
Level 3 (3,500–4,000m): Requires prescription AMS medication. Tour vehicles must carry large medical oxygen cylinders or portable oxygen concentrators to manage emergencies.
Levels 4 & 5 (Above 4,000m): Short-term oxygen cylinders are no longer enough. Every vehicle must be equipped with continuous medical oxygen concentrators for a 24-hour supply, accompanied by professional medics.
Expert Tip: Small oxygen canisters only last 0.5 to 2 hours. For prolonged high-altitude exposure, a continuous portable oxygen concentrator is a true life-saving necessity.
Beware of “AMS-Free” Guarantees
Travelers should avoid agencies promising a “100% AMS-Free” trip and instead verify emergency descent plans. Blood oxygen (SpO2) remains the gold standard:
≥95%: Normal.
90%–94%: Observe and use oxygen cylinders or portable oxygen concentrators.
<90%: Strict medical intervention required.
<85%: Immediate emergency descent and hospitalization.
The ultimate safety hierarchy is: Acclimatization > Medication > Equipment (e.g., portable oxygen concentrators) > Emergency Response > Medical Care.
