Carbon monoxide is a gas that is colorless and odorless. It is produced in combustion processes, and mostly comes from transportation emissions. In cities, up to 95% of carbon monoxide emissions come from automobiles.

Carbon Monoxide Health Effects

Carbon monoxide reduces the delivery of oxygen to the organs of the human body like the brain and heart, and can be deadly at very high levels of exposure. At low concentrations , fatigue is experienced in healthy people and chest pain in people with heart disease. At high concentrations, people can experience headache, dizziness, confusion, nausea, and impaired vision. Carbon monoxide (CO) can be deadly at very high levels of exposure. For those with existing forms of heart disease that already have a compromised ability to provide oxygenated blood to the heart, exposure to CO can further affect their ability to exercise or exert themselves. They may experience myocardial ischemia (reduced oxygen to the heart), which can bring chest pain (angina) when under stress or exertion.