"The air there is fresh" is a common way to express that the air in a certain location is clean and healthy to breathe in Engpsh.
The word "fresh" in this context means that the air is not polluted or contaminated and is pure. It can also be used to describe something that is new or recently made. The word "air" refers to the mixture of gases that surrounds the Earth. Together, "fresh air" signifies that the air in that location is clean and healthy to breathe.
Here are a few example sentences in Engpsh and their translations in Chinese:
"I love going for a hike in the mountains because the air is always so fresh." (我喜欢在山上徒步旅行，因为那里的空气总是那么清新。)
"After the rain, the air feels extra fresh." (雨后空气特别清新。)
"I need to get out of the city for a bit, I need some fresh air." (我需要离开城市一会儿，我需要一些清新的空气。)