In 1783, the Icelandic volcano Laki sent a sulphurous smog over Europe, plunging it into an extreme winter that killed thousands.
1783年，冰岛拉基火山喷发，硫酸烟雾，笼罩欧洲大地，陷入了极端的冬季，致使数千人死亡。
Northern China is often cloaked in smog, especially during the cold winter months when homes and power plants burn coal to keep warm.
中国北方城市经常被雾霾所笼罩，尤其是在寒冷的冬季，家庭和发电厂都是靠烧煤来取暖。
China's smog is worst in the winter, when households consume more electricity from coal-fired power plants, and municipal heating is turned on.
中国的雾霾在冬季里是最糟糕的。冬季时，家庭消耗更多由燃煤发电厂生产的电能，并且城市供暖系统开始运行。
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