The “airpocalypse” that settled on Beijing and vast swathes of northern China last week, blotting out the sun and shrinking visibility to a few meters, drove even longtime residents indoors. The air quality index, which measures a fine particulate known as PM 2.5, averaged more than 16 times the recommended upper limit. The Chinese capital became all but “unsuitable for human habitation,” as one report (quickly censored) put it.
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