The Car and Air Pollution

My topic today is "The Car and Air Pollution". In particular, I want firstly to discuss the ways in which the car causes air pollution; and secondly, how we can control or reduce air pollution from the car.
How does the car cause air pollution? what happens is that the car's internal combustion engines is a kind of chemical factory on a small scale. I uses a mixture of petrol and air, and mixture explodes and burns, to produce the energy which propels the car. But while this is happening, many complicated chemical reactions are taking place. In particular, part of the petrol-air mixture is not completely burned up, and so the exhaust gases from the engine contain some very dangerous chemicals, such as carbon monoxide, nitrogen oxides, leadand hydrocarbons.
This is the situation, then, and it's going to get much worse, unless we do someting about is.