From 2008-2011, the average PM2.5 air pollution level was nearly 150 micrograms while the WHO 24-hour limit is 25 micrograms.
It turns out, most of Ulaanbaatar pollution is from people burning coal to keep warm. A little heat is necessary where winter temperatures dip to -40 C.
Yet all that air pollution causes 1 in every 10 deaths in the capital, according to an academic study. That makes clean air an urgent need in this city of 1.2 million people.
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