There are natural sources of air pollution also. For example, volcanoes and forest fires produce a lot of pollutants. However, it is the increasing number and use of motor vehicles that is doing the most damage, and logically, where there are more cars, there is more pollution, that is, in the major cities of the world. Some of the most polluted cities in the world include Beijing, Mexico City, Athens, Moscow and Mumbai.
There are natural sources of air pollution also. For example, volcanoes and forest fires produce a lot of pollutants. However, it is the increasing number and use of motor vehicles that is doing the most damage, and logically, where there are more cars, there is more pollution, that is, in the major cities of the world. Some of the most polluted cities in the world include Beijing, Mexico City, Athens, Moscow and Mumbai.
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