The sky could be the brightest blue, but in the winter months no one in Mongolia’s capital city would be able to tell because of the lingering smog.
Ulaanbaatar is one of the most polluted capital cities in the world and also densely populated - it’s home to half of Mongolia’s three million population.
In winter, temperatures in the world’s coldest capital can plummet to minus 20 and the only way for many people to stay warm is to burn raw coal.
