carbon monoxide Keeping Carbon Monoxide Out Of The House By Geoffrey Riley & Charlotte Duren • Nov 14, 2013 Sideroxylon/Wikimedia Listen Listening... / 16:38 Charles Chase from the Oregon Fire Marshal's office explains the sources of carbon monoxide. Ah, winter. It can certainly be pretty in the right conditions, but the weather often forces us indoors, windows and doors shut, with some kind of heating system running. What could go wrong? Carbon monoxide, for one thing.