
Miasma
Negative Connotation
Miasma often suggests harmful or oppressive qualities of the unpleasant smell.

The entire alley was engulfed in a miasma that turned stomachs.
Intensity of Smell
It usually refers to strong, pervasive smells, not mild or fleeting ones.

As we entered the abandoned house, a miasma of mold hit us.
Evokes Visual Imagery
Although about smell, it can suggest a visible, fog-like presence.

A miasma hung over the landfill, visible from a distance.
Compare with
CloudContaminateExhalationFoulnessPolluteStenchToxicityVapour
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