China's gray smog has a blue lining: Air improves this year

Thursday, November 12, 2015 - 03:30 in Earth & Climate

Lawyer Wu Congsi has asthma and keeps air purifiers whirring away in his office, home and car to counter Beijing's hazardous smog. He prefers to stay inside unless the sky is blue. But this year, he's been able to regularly walk the 15 minutes or so to work.

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