Ulaanbaatar - capital of Mongolia.
Located in north central Mongolia, the municipality lies at an elevation of about 1,300 meters (4,300 ft) in a valley on the Tuul River. It is the country's cultural, industrial and financial heart, the centre of Mongolia's road network and connected by rail to both the Trans-Siberian Railway in Russia and the Chinese railway system.
This report says it has higher air pollution than New Delhi and Beijing.