afterdamp

[af-ter-damp, ahf-]
noun
an irrespirable mixture of gases, consisting chiefly of carbon dioxide and nitrogen, left in a mine after an explosion or fire.

Origin:
1855–60; after + damp

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World English Dictionary
afterdamp (ˈɑːftəˌdæmp)
 
n
See also whitedamp a poisonous mixture of gases containing carbon dioxide, carbon monoxide, and nitrogen formed after the explosion of firedamp in coal mines

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Exhausted volunteers found conditions in the mines almost unbearable, heat was intense, and afterdamp caused headaches and nausea.
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