What does it mean to be salubrious? (From Emily Bronte's Wuthering Heights)

A salubrious person or thing promotes health or welfare; wholesome.

[Linton] had grown tall of his age, still wanting some months of sixteen. His features were pretty yet, and his eye and complexion brighter than I remembered them, though with merely temporary lustre borrowed from the salubrious air and genial sun.

From Emily Bronte's Wuthering Heights.