mi·as·ma /maɪˈæzmə, mi-/
  毒氣,沼氣
  mi·as·ma /maɪˈæzmə, mɪ-/ 名詞
  Mi·as·ma n.; pl. Miasmata   Infectious particles or germs floating in the air; air made noxious by the presence of such particles or germs; noxious effluvia; malaria.
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  miasma
       n 1: an unwholesome atmosphere; "the novel spun a miasma of death
            and decay"
       2: unhealthy vapors rising from the ground or other sources;
          "the miasma of the marshes"; "a miasma of cigar smoke"
       [also: miasmata (pl)]