Hundreds of flights were delayed or cancelled on Friday in China’s commercial hub of Shanghai as record levels of air pollution shrouded the city in smog, prompting authorities to issue the highest level of health warning.
On Friday afternoon, the Shanghai government issued its severest health warning as the city’s pollution index ranged between 23 times and 31 times the levels recommended by international health officials.
In the first such advice since a new health warning system was launched in April, authorities urged residents to stay indoors and asked factories to either cut or halt production.
“I don’t think it’s fit for people to live in this kind of environment,” said Shanghai resident Fan Jianjun, 34, who…
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