Pollution Chokes Chinese Cities as Smog Spurs Indoor Warnings
Heavy pollution hangs in the air over elevated motorways in Shanghai.
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Heavy clouds of smog in China’s northern and eastern regions are prompting warnings for children and the elderly to stay indoors in metropolitan areas including Beijing and Shanghai.
Concentrations of PM2.5 -- particles considered the most dangerous to health -- rose to as high as 176 micrograms per cubic meter at 11 a.m. in Shanghai, indicating “heavy” pollution, according to the Shanghai monitoring center.