China issues smog alert

China's meteorological authority has issued a yellow alert as heavy smog will shroud Beijing, Tianjin and Hebei province in the next three days.

Foggy weather will appear in north China and areas along the Yellow and Huaihe rivers, while some parts of Beijing and Tianjin, and the provinces of Hebei, Shandong and Liaoning will see heavy air pollution until Wednesday morning, the National Meteorological Center (NMC) said on Tuesday.

The NMC forecasted that the smog will by dispersed by a cold front on Friday.

China's meteorological alerts are categorized as blue, yellow, orange and red as the severity ascends.

Beijing among most polluted areas

Beijing and neighboring Tianjin and Hebei province see more severe air pollution than the rest of the nation, the Ministry of Environmental Protection said in a report released on Tuesday.