With the (develop) of industry, air pollution is getting more and more serious. In Beijing, many people suffer different kinds of illnesses because air pollution. Air pollution is caused by the following (reason): about half of the problem is caused by vehicles. There are more and more cars, buses on the roads, and they give off (poison) gases. 25% of air pollution is caused by factories. Another factor is the smokers. Smoking not only does harm to their health to others. these, about 10%of air pollution is caused by other reasons. We should take some measures to fight pollution. New fuel can be used to take place of gas. We can plant more trees. If everybody realizes the(important) of environment and does something to stop pollution, the problem will (solve).
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