Photo by Matthieu Paley @paleyphoto / Ulaanbaatar’s Dari Ekh neighborhood is crowded with migrants from the countryside, nomadic herders who come to Mongolia’s capital seeking education and jobs. Living in simple houses or round tents called gers, with inadequate or no electricity, they burn coal to keep warm through the harsh winters. One study found that children in the capital had 40 percent lower lung function than rural kids—a red flag for long-term health problems.This is the opening image of a global story titled “The Deadly cost of Dirty Air” that appears in the April edition of National Geographic magazine. For more insights into our world, follow @paleyphoto #airpollution #mongoliairpollution #coal #Ulaanbaatar #urbanmigration

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