With the(develop) of industry, air pollution is getting more and more serious. Air pollution is caused by the following (reason). About half of the pollution results vehicles. There are more and more cars and buses on the roads, give off poisonous gases. 25% of air pollution is caused by factories. Another factor is the smokers. (smoke) not only does harm to their health but also to others.these, about 10% of air pollution is caused by other reasons. We should take some measures(fight) against pollution. New fuel can be used to take the place of gas. We can plant(many) trees. If everybody realizes the (important) of the protection of the environment and does something to stop pollution, the problem will (solve).
