a form of air pollution that is or looks like a mixture of smoke and fog, especially in cities 烟雾（烟与雾混合的空气污染物，尤见于城市） attempts to reduce smog caused by traffic fumes 旨在降低车辆尾气造成的烟雾的措施
Extra ExamplesTopics The environmentc1Smog levels are high today. 今天烟雾很大。 a layer of smog over the city 笼罩着城市的一层烟雾 The streets are clean, there's no traffic, and there's no smog to block out the sunshine. 街道很干净，没有交通，也没有烟雾阻挡阳光。 Nowadays, smogs are very common in major cities. 如今在大城市里烟雾是非常普遍的。
Oxford Collocations Dictionaryadjective- heavy
- urban
- photochemical
- …
- layer
- reduce
- alert
- level
Word Originearly 20th cent.: blend of smoke and fog.
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