As nouns the difference between healthiness and salubrity
is that healthiness is (uncountable) the state or quality of being healthy while salubrity is the quality of being salubrious or invigorating.
healthiness
English
Noun
(en-noun)
(uncountable) The state or quality of being healthy.
(countable) The product or result of being healthy.
salubrity
English
Noun
(salubrities)
The quality of being salubrious or invigorating.