noun
stench
STENCH/stentʃ/
A strong, unpleasant smell.
The stench from the overflowing bin makes the passerby cover his nose.

Etymology
Old English stenc could describe either a pleasant or an unpleasant smell. Its already common association with bad odors became dominant, producing the modern strongly unpleasant sense.
In context
The stench made animals and humans feel sick alike.