Shanghai's Worst Smog in Two Years Spurs Production Limits

  • Schools ordered to keep children indoors as emergency measure
  • Yellow haze alert signals heavy pollution may persist

Tourists walk on the Bund in Shanghai during heavy smog on Dec. 14.

Photographer: Zhong Yang/Imaginechina via AP Images

Shanghai ordered schools to keep children indoors and factories to limit production as a hazy smog enveloped the metropolis and the most dangerous air contaminants reached the highest levels in two years.

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