Thick choking smog returns to blanket Beijing, visibility falls below 100 metres
Yellow alert issued with poor air quality likely to last into the weekend
Beijing woke up to choking smog on Friday with neighbouring areas including Hebei province and Tianjin also blanketed by heavy air pollution.
Beijing residents face a weekend of hazardous smog, the Beijing Meteorological Station forecast, with other parts of northern China also likely to see similar conditions until late on Saturday, Chinese media reported.
Visibility dropped to below 100 metres in some areas of Beijing on Friday as air pollution mixed with heavy fog, the Weather China website reported.
The Beijing Meteorological Station issued a yellow alert, the lowest level in a three-tier system, warning of poor air quality.
Smog has affected major regions in northern China since Thursday, with Harbin, Daqing and Suihua, three major cities in northeastern Heilongjiang province, exceeding the maximum air quality index level of 500 points, the China News Service reported.