We examined exposure to air pollution caused by households’ wood burning of cooking, generating sets and vehicle emissions of carbon monoxide (CO) poisonous gas in the most populated urban city of Lagos Southwestern part of Nigeria. It is a known fact that many families including children and pregnant women; infant babies and individuals lost their lives due to poor quality air control policies, and inefficient control of air pollution caused by this deadly gas. Many are suffering with heart-related diseases as a result of CO poisoning and Government is not showing serious concern in this part of the world. All of the foregoing motivates this study to determine the level of human exposure to this deadly gas using Carbon Monoxide Detector so as to create the necessary adequate awareness of the quality of air within the metropolis whereby preventive measures could be put in place to curb the devastating effects on the innocent citizens, most importantly, the children.