With an economy rooted in river transportation, steel, smelting, and the manufacturing of automotive parts, factory smog builds a haze over the city that virtually never dissipates.

• 随着经济的根植于河流运输，钢铁，冶炼和制造汽车零部件，工厂建立了烟雾市上空烟雾，几乎从来没有消散。