The Impact of Geographical and Economic Factors on Air Quality in Europe

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The most polluted big city in Europe is Milan, writes CNN's John Sutter. He says there are a couple of reasons for that: geography and economics. In Central and Eastern Europe, coal deposits meant the energy was very cheap, he adds. But even as communist era industry disappeared, those smokers and poorly insulated homes still remain.

Clashes in Khartoum have turned deadly as two rival military factions fight for power. As the conflict escalates, a transition to civilian rule could be in jeopardy. Europe’s cities have a worrying pollution problem and clearing the air is proving difficult. And a new way to measure the environmental impact of food.

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