An oppressive or unhealthy atmosphere; historically, noxious air once believed to spread disease.

From Greek miasma, pollution or stain, from miainein, to pollute.

fumes pollution stench fog
freshness purity clarity cleanliness
"Each winter a toxic miasma of vehicular and stubble-burning smoke settles over the Indo-Gangetic plain."

Vivid for GS3 environment answers on air pollution and public health. It also works figuratively in essays, for example, 'a miasma of corruption can erode citizens' faith in public institutions.'

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