1930年12月1至15日——比利时马斯河谷烟雾事件马斯河谷是比利时境内马斯河旁一段长24千米的河谷地段。这一地段中部低洼,两侧有百米的高山对峙,使河谷地带处于狭长的盆地之中。马斯河谷地区是一个重要的工业区,建有3个炼油厂、3个金属冶炼厂、4个玻璃厂和3个炼锌厂还有电力、硫酸、化肥厂和石灰窑炉,工业区全部处于狭窄的盆地中。 December 1, 1930 - The Smog Incident, Belgium The Maas Valley is a 24-kilometer stretch of river valley next to the Maas River in Belgium. This section of the central low-lying, with 100 meters on both sides of the mountain confrontation, the valley in the narrow basin. The Maas Valley area is an important industrial area with three refineries, three metal smelters, four glassworks and three zinc smelters as well as electricity, sulfuric acid, fertilizer plants and lime kilns, and all industrial areas In a narrow basin.