The sustainable development of "ger" areas in Ulaanbaatar, the capital of Mongolia, is one of the critical development issues facing the country. The ger areas host 60% of the population of Ulaanbaatar, and they have expanded 35 times larger than the original center of the city. Provision of basic services (e.g. heating and water supply) is very limited or non-existent in ger areas. The lack of basic public services resulted in air and water pollution as well as serious health risks to residents. The government tries to control expansion of the city, particularly ger areas, but its policy...