irrespirable

[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)
 
adj
not fit for breathing or incapable of being breathed

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Example sentences
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 entering an irrespirable
  atmosphere unawares.
Immediate donning eliminates the chance for a miner to enter an irrespirable
  atmosphere.
The location and content of any irrespirable atmospheres.
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