asphyxiate
If you suffer from asthma, allergies can bring on an attack, and in some cases cause asphyxiation.
Asphyxiation from excess carbon dioxide was responsible for the die off of large numbers of fish.
Chemical choking agents attack lung tissues, causing asphyxiation.
They suffered asphyxiation in their sleep after ventilation in their shelter was blocked by snow, causing a deadly buildup of fumes from the stove.

SMART Vocabulary: related words and phrases

Animal physiology: breathing & stopping breathing
aerobic
asphyxia
aspirate
breathable
breathe (something) in
breathe (something) out
choke
draw breathphrase
expire
hyperventilation
non-breathing
out of breath
pant
puff
puffed
puffed out
puffer
stifle
strangulation
suffocate

You can also find related words, phrases, and synonyms in the topics:

Murder & attempted murder