Guardian: They call Mongolia the "land of blue sky"; its spectacular desert, forest and grasslands are blessed by sun for two-thirds of the year. But climb to a snow-dusted hilltop overlooking Ulan Bator and you see a thick grey band hanging over the city. In the coming weeks, as temperatures plummet, the smog will spread across the streets and into homes, shutting out the light.
While Beijing's "airpocalypse" has made headlines worldwide, it pales beside the haze of the Mongolian capital. Ulan Bator is...