a form of air pollution that is or looks like a mixture of smoke and fog, especially in cities 煙霧（煙與霧混合的空氣污染物，尤見於城市） attempts to reduce smog caused by traffic fumes 旨在降低車輛尾氣造成的煙霧的措施
Extra ExamplesTopics The environmentc1Smog levels are high today. 今天煙霧很大。 a layer of smog over the city 籠罩着城市的一層煙霧 The streets are clean, there's no traffic, and there's no smog to block out the sunshine. 街道很幹淨，沒有交通，也沒有煙霧阻擋陽光。 Nowadays, smogs are very common in major cities. 如今在大城市裏煙霧是非常普遍的。
Oxford Collocations Dictionaryadjective- heavy
- urban
- photochemical
- …
- layer
- reduce
- alert
- level
Word Originearly 20th cent.: blend of smoke and fog.
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