What is Carbon Monoxide?
This website is one of the best I've found:
Carbon Monoxide Safety: - How to Protect Your Home, Identify Issues, and Respond to Emergencies. Carbon monoxide is a tasteless, odorless, invisible gas that occurs naturally through combustion, or, the process of burning. Low exposure to carbon monoxide can cause symptoms similar to the flu. In high doses, exposure to carbon monoxide can be lethal. read more here ...
See also: Carbon_monoxide_poisoning