The Collaborative International Dictionary of English v.0.48:

Insalubrity \In`sa*lu"bri*ty\, n. [Cf. F. insalubrite.]
   Unhealthfulness; unwholesomeness; as, the insalubrity of air,
   water, or climate. --Boyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "insalubrity":
   air, badness, contamination, harmfulness, health hazard,
   injuriousness, insalubriousness, menace to health, noise pollution,
   noisomeness, noxiousness, pathenogenicity, pollution,
   unhealthfulness, unhealthiness, unsalutariness, unwholesomeness,
   water