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Carbon monoxide (CO) is a colorless, odorless deadly gas. Because you can't see, taste, or smell it, carbon monoxide can kill you before you know it's there. Everyone is at risk for carbon monoxide poisoning. Experts believe, however, that individuals with greater oxygen requirements such as unborn babies, infants, children, senior citizens, and people with coronary or respiratory problems are at greater risk. Why is carbon monoxide so dangerous? The great danger of carbon monoxide is its attraction to hemoglobin in the bloodstream. When breathed in, carbon monoxide replaces the oxygen which cells need to function. When CO is present in the air, it rapidly accumulates in the blood, causing symptoms similar to the flu, such as headaches, fatigue, nausea, dizzy spells, confusion, and irritability.
Carbon Dioxide, on the other hand, cannot form COHb to inhibit the transport of oxygen, though high levels can be toxic, but through a different process. Toxic levels of carbon dioxide are less likely to be produced in natural circumstances, but OSHA (in the United States) has set limits and regulations on the handling and safe exposure to it. Carbon Monoxide is deadly at only 0.04% atmosphere concentration, while Carbon Dioxide not considered deadly until much higher concentration of 5%. Both CO and CO2 are toxic to aerobic animal life (oxygen-breathers), because both block the absorbtion of oxygen. Carbon monoxide is just more potent.