Synonyms of smog
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fogWhen there is fog, there are tiny drops of water in the air which form a thick cloud and make it difficult to see things.
• The crash happened in thick fog.
hazeIf there is a haze of something such as smoke or steam, you cannot see clearly through it.
• Dan smiled at him through a haze of smoke and steaming coffee.
vapourVapour consists of tiny drops of water or other liquids in the air, which appear as mist.
• a cloud of poisonous vapour
Thesaurus for smog from the Collins English Thesaurus