Source : Webster's Revised Unabridged Dictionary (1913)

Malodor \Mal*o"dor\, n.
   An Offensive to the sense of smell; ill-smelling. --
   {Mal*o"dor*ous*ness}. n. --Carlyle.

Source : WordNet®

malodorousness
     n : the attribute of having a strong offensive smell [syn: {stinkiness},
          {foulness}, {rankness}]