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miasma [m(a)ɪ'æzmə] n
gen.	a noxious atmosphere or emanation once thought to originate from swamps and waste, and to cause disease (plural miasmas or miasmata: There was an earthy smell, as of some dry miasma, which came through the fouler air. (1897, Bram Stoker, Dracula) wiktionary.org)
fig.	a noxious atmosphere or influence, an ominous environment (plural miasmas or miasmata: It was into this lossy compression miasma that aptX was born. wiktionary.org)