He went through the day with his mind in a fog.

整整一天，他的头脑都是昏昏沉沉的。

《牛津词典》

On several occasions, pollution combined with fog has been so bad that motorists have had to turn on their headlights in the middle of the day.

还有好几次是污染伴随着大雾，糟糕到大中午汽车都得开前灯才行。

youdao

The primary phase of all meteorological elements is short, but with more fog days and a better regularity of fog day probability.

各成雾气象因素的主段均短，对应雾日多，对应的雾日机率规律性好；次段虽长，对应雾日却少，规律性有的也较差。

youdao

The Indian capital, Delhi, has shivered through its coldest day for 44 years, with dense fog causing travel chaos.

BBC: Delhi shivers on coldest day for 44 years

The day was gray and moist, with low clouds weighing on the rooftops and a thin fog floating below.

NEWYORKER: Waiting