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A traffic policeman inspects vehicles in Shahe, north China's Hebei Province, Jan. 10, 2018. Hebei province weeded out 1.3 million outdated and heavy-polluting vehicles in recent years. (Xinhua/Mu Yu)
A traffic policeman inspects vehicles in Shahe, north China's Hebei Province, Jan. 10, 2018. Hebei province weeded out 1.3 million outdated and heavy-polluting vehicles in recent years. (Xinhua/Mu Yu)