Snow activities at high altitudes require more caution than ordinary winter sightseeing. Places such as Sela Pass and Bum La combine freezing conditions with thin air, strong winds and slippery ground, so even simple activities can become tiring more quickly than expected.
Keep physical activity gentle and watch for signs of altitude sickness, including headache, dizziness, nausea, unusual fatigue and breathlessness. If symptoms worsen or become severe, stop the activity, move to a lower elevation when possible and seek medical assistance rather than continuing with the day's sightseeing.
Wear warm layers and footwear with strong traction, and avoid running on icy or compacted snow. Stay away from steep slopes, unstable snowbanks, road edges and other areas where a slip could have serious consequences. Never walk onto a frozen lake simply because its surface appears solid.
Mountain weather can change quickly, reducing visibility or making roads unsafe. Check current conditions before leaving, follow local restrictions and return early if snowfall, fog or ice begins to affect the route. Do not remain at a high-altitude location simply to wait for clearer views or better photographs.
Carry water, snacks, essential medicines, a charged phone, power backup and an extra warm layer. Use an experienced local driver for high-altitude winter routes, keep snow activities within safe roadside or established visitor areas, and be prepared to cancel an excursion when conditions are unsuitable.