A resident wears an anti-pollution mask in Dalian, Northeast China’s Liaoning province, on Monday. Photo: VCG

The smog reduces visibility for drivers in Dalian’s Ganjingzi district on Monday. Photo: VCG

Smog clouds the horizon in Dalian. Photo: VCG

In Liaocheng, East China’s Shandong province, a man walks across a bridge whose other side is hidden by smog. Photo: VCG

A buddled-up resident cycles through the smog in Qingzhou, Shandong. Photo: VCG

A policeman directs traffic in Shijiazhuang, North China’s Hebei province. Photo: VCG

A pedestrian takes a dog for a walk Sunday in Xiongan, Hebei. Photo: VCG

A woman walks through Shougang Park in Beijing on Sunday. Photo: VCG