雾天在英语中被称为"foggy weather"。这个词的来源可能源于英语单词"fog"，这个词本身源于中世纪拉丁语"fumigare"，意思是"把烟雾弄得浓密"。

例句：

It's a foggy morning, so drive carefully. (今天是雾天，所以开车要小心。)

I don't like walking in the park on foggy days. (我不喜欢在雾天里在公园散步。)

The foggy weather made it difficult to see the road ahead. (雾天使得看不清前方的道路。)