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Some people can have a carbon monixide build-up without experiencing any pain or sickness.
They pump into the air nitrogen and sulfur oxides (components of acid rain), carbon monixide, acid gases, dioxins and furans (extremely toxic substances suspected of causing cancer and genetic defects), and 28 different types of heavy metals, including lead, cadmium, and mercury.
2 and carbon monixide (CO) were delivered together for 30 minutes--a situation representative of fire conditions--concentrations of CO.