smog [smɒg]

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n.烟雾 (由smoke+fog合成的词)

air pollution , especially in cities , that is caused by a mixture of smoke , gases and chemicals

Smog blankets the city. 烟雾笼罩着这个城市。
The sky over the city was overspread with a heavy smog. 城市上空罩上了一层烟雾。