Carbon monoxide is produced when organic material explosives or any other type of carbonate material is burned under insufficient.
Source
Any process in which incomplete combustion of organic material can occur is a potential source of carbon monoxide.
The number of non-fatal poisoning victims suffering from persistent nervous system disorders is estimated to exceed this figure. The magnitude of the health hazards, fatal and non-fatal, from carbon monoxide is enormous, and the poisoning appears to be much greater than is currently identified.