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The rising levels of congestion and air pollution found in most of the world cities can be attributed directly to the rapidly increasing number of private cars in use. In order to reverse this decline in the quality of life in cities, attempts must be made to encourage people to use their cars less and public transport more. Discuss possible ways to encourage the use of public transport. Unfortunately, air pollution is increasing in the world's big world cities. There are many problems, but four cases will be mentioned here,. first of all, people use their cars in cities, second, factories, third, cutting trees, and forth, tall towershigh- rises. The most important problem of air pollution is that many people do not use public transportation, for example, the subway, buses, taxis and bicycle, so they prefer to go to work or university by in private cars. Decreasing Heart diseases, light streets traffic, clear sky, walking and aerobic exercise in fresh air are items that people are encouraged to use public transportation. However, Public transportation must be invested in by governments. For instance: new buses, trucks and hybrid taxis reduceing air pollution. On the other hand, all of the factories must be made in on the eastern side of the cities. Because the wind blows from the west to east. It causes clear air flow enters to cities. Cutting trees arise leads to air pollution, as well. If a tree is cut downcuts, itthe tree won't do photosynthesis, so it does is not produced oxygen gas that which purifies the air, in this case the amount of monoxide carbon gas increases, and then air pollution has beenwill be created. And, a tall buildings towers have effect on air pollution. They cause air flow mass does not to pass, hence it is motionless. The worst condition of it occurs in winter that which is named temperature inversion. In conclusion, the most important factor of in air pollution is that people use their private car. According to the above, I hope they will be encouraged to use public transportation more and more.