Air pollution is becoming an increasing problem in the world. As more countries around the world begin to industrialize, the factories and power plants they build cause a lot of pollution. Older factories cause air pollution that are harmful to people and can be damaging to the environment. This thick smog can be seen near urban areas where many people live. In some of these cities around the world, people get sick just from breathing polluted air every day. People need to begin to deal with this pollution problem before it gets any worse. Anyone can help solve this problem by using less energy and electricity. Also, more countries around the world need to use power plants and factories that cause less pollution. <<Which word best replaces urban in the passage above?>>
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