Beijing: More than 100 million people in China have been warned to stay indoors after at least 10 Chinese cities issued red alerts for smog, state media reported Thursday.
Pollution covered large parts of the country`s east and centre as measures to curb the toxic haze were ordered to be implemented.
The alert came as broad swathes of the country suffered through their fourth wave of choking pollution this month.
In addition, the eastern province of Shandong, with a population of almost 96 million and in which some of the cities 10 cities are located, issued its first ever top-level warning Wednesday, the provincial environmental bureau said.
It is believed to be the first time an entire province has issued a red alert. The ten cities include the sprawling industrial hub of Tianjin in the northeast.