Translation 9Air pollution can spread from city to city. It even spreads from one country to another. So air pollution is really a global problem. Air pollution may kill people, especially babies, older people, and those who have diseases with their breath. Air pollution increases the risks of certain lung diseases. There are other possible health dangers from air pollution that we don’t know much about. For example, scientists are trying to find out whether chemicals that reach us from the air may cause changes in our cells. These changes might cause babies to be born with serious birth defects. Scientists are trying to learn how all the chemicals we are apt to take into our body work.