BEIJING -- China has gone to Olympian lengths to try to ensure that its skies are clear for the Summer Games, which formally kick off in 10 days. It has spent $17 billion on antipollution measures in recent years. Last week, it forced more than a million cars off the streets, halted construction in and around the city, and temporarily closed hundreds of factories in surrounding provinces.
But despite these measures, the Chinese capital remains mired in a gray haze, and...
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