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Where Does Carbon Monoxide (CO) Come From?

CO is Produced when:

Carbonaceous materials are burned with insufficient oxygen. Its lethal effects have been known for centuries; in ancient Rome, "coal gas" was used for executions and suicides.

Man-made sources of CO include:

Incomplete fuel combustion used in transport -
Automobile/Truck exhaust
Airplane exhaust
Smoking of cigarettes, cigars, pipes, etc.
Defective heating (furnace, water heater) systems
Defective cooking appliances
Industrial plant exhausts
Burning of solid waste
Detonation of explosives

Natural sources of CO also exist but they contribute very little to the overall atmospheric CO level.

Geophysical

Marsh gases
Forest fires
Volcanic gases
Natural gases in coal mines
Photo-dissociation of CO in upper atmosphere
Formation of CO during electrical storms

Biological

Endogenous CO production by land animals
From vegetation during seed germination
From marine brown algae or kelp
Marine hydrozoans: e.g. jellyfish

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Used with permission from the author David G. Penney, PH.D.