1.0                     INTRODUCTION
Air pollution is associated with increasing cases of many adverse health effects, e.g. mortality, respiratory diseases and cancer. The chemical composition of ambient air is very complex and depends on many different factors, traffic generated air pollution being a major source in large cities. This is especially true in the developing world, mainly due to the high proportion of old, poorly maintained vehicles, the abundance of two stroke vehicles and the poor fuel quality (Baumbach et al., 1995; Gwilliam 2003). All these factors contribute to one of the major air pollutant in urban areas; carbon monoxide (CO).
CO is a poisonous, colorless, inevitable gas that has neither taste nor smell. It is formed when carbon burns with too little air (incomplete combustion) (Smith and Scott, 2002). Carbon monoxide (CO), also called Carbonious oxide or Carbon (II) Oxide and is slightly lighter than air. CO is a deadly, colorless, odorless, poisonous gas, produced by the incomplete burning of various fuels, including coal, wood, charcoal, oil, kerosene, propane, and natural gas. Products and equipments and machines powered by internal combustion engines such as portable generators, cars, lawn mowers, and power washers also produce CO. It has a high affinity for hemoglobin in blood and displaces O2 to form carboxyl hemoglobin (COHb). This can cause dizziness, headaches and eventually death.