mephitic

from WordNet (r) 3.0 (2006)

mephitic
    adj 1: of noxious stench from atmospheric pollution [syn:
           {miasmic}, {mephitic}]

from The Collaborative International Dictionary of English v.0.48

Mephitic \Me*phit"ic\, Mephitical \Me*phit"ic*al\, a. [L.
   mephiticus, fr. mephitis mephitis: cf. F. m['e]phitique.]
   1. Tending to destroy life; poisonous; noxious; as, mephitic
      exhalations; mephitic regions.
      [1913 Webster]

   2. Offensive to the smell; as, mephitic odors.
      [1913 Webster]

   {Mephitic air} (Chem.), carbon dioxide; -- so called because
      of its deadly suffocating power. See {Carbonic acid},
      under {Carbonic}.
      [1913 Webster]