Sela Pass sits above 4,000 metres, so high altitude and severe winter weather need to be taken seriously. Travellers arriving from lower elevations may experience headache, dizziness, nausea, tiredness or unusual breathlessness, even during a relatively short stop.
Keep physical activity gentle and avoid running, climbing steep slopes or walking long distances immediately after reaching the pass. Moving gradually through Bomdila and Dirang before travelling higher can make the ascent less abrupt, although it does not eliminate the risk of altitude sickness.
If altitude symptoms become severe or continue to worsen, move to a lower elevation and seek medical assistance. Severe breathlessness at rest, confusion, difficulty walking normally or marked deterioration should not be ignored. Do not continue higher simply to complete a sightseeing plan.
Winter adds further risks from snow, ice, strong winds and rapidly changing visibility. Wear proper insulated layers and footwear with good grip, stay within safe roadside or designated sightseeing areas, and never walk onto a frozen lake because the strength of the ice cannot be judged by appearance.
Check current weather and road conditions before leaving Dirang or Tawang. Follow local restrictions if snowfall or ice affects access, and do not assume the exposed pass road is safe simply because through traffic is operating via the Sela Tunnel.
Carry water, snacks, essential medicines, identification, permits and extra warm clothing in the vehicle. Keep the Sela stop relatively relaxed and flexible, particularly during active snowfall or extreme cold, rather than extending the visit solely for photographs or snow activities.