noun
a slight or invisible exhalation or vapor, especially one that is disagreeable or noxious
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The effluvium emitted from the factory's smokestacks was a cause for concern among nearby residents.
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The effluvium coming from the sewer was absolutely disgusting.
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I couldn't stand the effluvium wafting from the dumpster behind the restaurant.
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The effluvium of negativity surrounding him was palpable.