Air pollution is caused by the emission of toxic gases from vehicles, factories and open burning. Nowadays, there are more and more vehicles on the road as society gets more affluent. More and more people strive to have a better quality of life by having the convenience of driving to their destinations instead of taking public transportation. Automobiles provides transport to millions people around the world to enable them to travel to their workplace, school and other places, therefore, the air around us is getting more polluted by the carbon dioxide that is emitted. Carbon monoxide is another type of gas which harmful to the environment as it can cause the reduction of oxygen in the bloodstream.