Buildings in Shijiazhuang, North China’s Hebei province are shrouded in smog on Thursday morning, December 1, 2016. Authorities in the province on Wednesday issued an air pollution red alert for heavy smog, the first high-level warning issued by the province this year. According to the authorities, the smog will hit the province from Dec. 2 to 4. Most cities in the province's central and southern regions are placed under red alert. (Photo: China News Service/Zhai Yujia)
