Do I need to prepare a mask to travel to Tibet?

Masks are mainly personal needs, not necessities.

Don't do strenuous exercise or drink too much when traveling at high altitude.

There is a big temperature difference between morning and evening, so keep warm. Take clothes and a windproof and warm coat. You can approve them in the morning and evening and take them away at noon.

Prepare sun protection equipment, sun protection, umbrella and high-altitude ultraviolet rays to avoid sunburn.

Be prepared psychologically. Traveling in the west is long, the road conditions are poor, and the eating habits are different. It's best to prepare some portable chocolates and simple side dishes, but it's best not to bring vacuum-packed food, because the plateau pressure is easy to explode.

Make a preliminary understanding of the scenic spots and folk customs there, especially Tibet. There are many scenic spots related to Buddhist culture in Tibet, and the folk customs in Tibet are somewhat different from those in China. Do some understanding to avoid embarrassment at that time.