当我们说 something is in the air 空气中有什么东西的时候，其实是想表达一件令人兴奋的事情有可能即将发生。

例句

Spring is in the air - it's a time for change!

There's definitely something in the air - two of my friends have announced they are getting married.

There was a feeling in the air the athlete would win gold.

请注意

A breath of fresh air 意思是一阵清风，给人焕然一新的感觉。

Anna has lots of wonderful ideas and motivation - she's a breath of fresh air.

The new coat of paint in the lounge has given the room a breath of fresh air.