Khata presented upon arrival at the airport in Tibet (http://tibetpedia.com/lifestyle/khata/).
Every hotel room we stayed in was equipped with gas masks. Tibet was no exception.
We visited a "typical" Tibet family dwelling.
Yak dung was the primary source of fuel.
Drying dung on the roof tops.
Yaks, or at least yaks that have been cross bred with cattle.
The family temple.
