[B]ULAN BATOR (AFP) As her seven children scamper in and out of the small door of their traditional felt hut in Mongolia's capital Ulan Bator, Narantuya sits over the stove, pouring blocks of black coal onto the fire.

In a city where average winter temperatures hover at a punishing minus 20 degrees Celsius (minus 4 Fahrenheit), the stove is the only source of heat for the 39-year-old unemployed single mother and her children.

Coal stoves coat Mongolian capital in smog - Yahoo! News