Article: Carbon monoxide.

Heating with wood is cozy and inexpensive, but be careful of the silent killer:

A by-product of combustion, this invisible, colorless, odorless, and tasteless toxic gas gets into the bloodstream and weakens the body's defenses.

Carbon monoxide is produced when natural fuels are burned at high temperatures with incomplete combustion in a gas or oil furnace, gas water heater, fireplace, space heater, wood stove, or any appliance that operates on a flammable fuel like natural gas, fuel oil, wood, coal, or kerosene, as well as gasoline, propane, and diesel. This also includes gas ranges and ovens, gas clothes dryers, and charcoal grills.

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