乌兰巴托栖居于海拔约1 300米的蒙古大草原上常被认为是世界上最冷的首都。
Perched on the Mongolian steppe, around 1, 300m above sea level, Ulaanbaatar has often been described as the world's coldest capital city.
研究发现，蒙古首都乌兰巴托年均可吸入颗粒物浓度为每立方米279微克，其后是又一个伊朗西部城市，萨南达杰，浓度为每立方米254微克。
The study found that the Mongolian capital Ulan Bator had an annual average PM10s density of 279 micrograms per cubic meter, followed by another west Iranian city, Sanandaj, with 254 micrograms.
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