Usually carbon monoxide is produced during burning of fuels such as gasoline, coal, wood, charcoal, kerosene, natural gas, propane and heating oil, and almost any other combustible material such as tobacco, fibers and paper. There is even more risk of CO accumulation if your home is tightly sealed and not properly ventilated.
While smoke inhalation from fires is a common cause of CO poisoning, cigarette smoke and vehicle exhaust are the most common sources of CO exposure. If your home has an attached or “tuck-under” garage, air and any pollutants in the air flow from the garage into your home. So, if you leave a car or other combustion engine running inside your garage, or if an air intake duct to your home is located next to a heavily traveled road or near a loading dock, CO can accumulate inside your home.
Any fuel-burning equipment or appliances, including wood stoves, fireplaces, space heaters, barbecue grills, furnaces, water heaters, boilers and ranges, have the potential to produce carbon monoxide.
When natural gas equipment is properly operated and maintained, it usually will not produce carbon monoxide.