ir·res·pi·ra·ble

[ih-res-per-uh-buhl, ir-i-spahyuhr-uh-buhl]
adjective
not respirable; unfit for breathing.

Origin:
1815–25; < Late Latin irrespīrābilis. See ir-2, respirable

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irrespirable (ɪˈrɛspɪrəbəl, ˌɪrɪˈspaɪərəbəl) [Click for IPA pronunciation guide]
 
adj
not fit for breathing or incapable of being breathed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Irrespirable is always a great word to know.
So is ninnyhammer. Does it mean:
a scrap or morsel of food left at a meal.
a fool or simpleton; ninny.
Example sentences
The location and content of any irrespirable atmospheres.
Self-contained self-rescuers are used to protect the wearer from the effects of
  toxic and/or irrespirable atmospheres.
Immediate donning eliminates the chance for a miner to enter an irrespirable
  atmosphere.
Accidents similar to this scenario have occurred and resulted in inundations of
  water, methane, or irrespirable atmospheres.
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