What unhealthy vapours come from decaying matter?
Ultimately, carbon dioxide, which is not that unhealthy. Its only bad for you when you get too much. Decaying matter is known for its stench, however carbon dioxide is odorless. The fragrant vapors are hydrogen sulfide (nasty smell like rotten eggs and very bad for you), amines from break down of protein (bad smell like poop or feces that also are not good for you), and volatile organic acids (smell bad and are not very good for you). Add to this, bacteria and fungal spores that may become airborne off the surface, which are definitely not good for you, and can have an odor, and the subject becomes really disgusting. Follow the link below to get Wikipedia’s take on it.
