Pollution is becoming a major problem these days,especially in our cities. It is not just pollution of the water, and the amount of rubbish in streets,but there is also pollution of the atmosphere,or air pollution. Air poolution is caused by severl sources. One of the causes is poisonous fumes from our cars or motorbikes. Vehicle emissions contain carbon monoxide which is very toxic and unhealthy for us. As the number of vehicles increase,the levels of air pollution raise