The Collaborative International Dictionary of English v.0.48:

Salubrious \Sa*lu"bri*ous\, a. [L. salubris, or saluber, fr.
   salus health; akin to salvus safe, sound, well. See Safe.]
   Favorable to health; healthful; promoting health; as,
   salubrious air, water, or climate.
   [1913 Webster]

   Syn: Healthful; wholesome; healthy; salutary.
        [1913 Webster] -- Sa-lu"bri*ous*ly, adv. --
        Sa*lu"bri*ous*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

salubriousness
    n 1: the quality of being salubrious and invigorating [syn:
         salubrity, salubriousness] [ant: insalubriousness,
         insalubrity]