Salubriousness means the quality of being healthy and good for you, especially when talking about air or climate.
Salubriousness is a good thing because it means something is good for your health.
Examples:
The salubriousness of the mountain air made her feel better.
The doctor recommended moving to a place known for its salubriousness.
We all want to live in a place with good salubriousness.
The salubriousness of the fresh fruit and vegetables made her feel strong and happy.
The salubriousness of the clean water was so good that it made everyone feel better.
The salubriousness of the sunny beach made her feel healthy and strong.