The point of view of the author of this passage seems to be:
People tend to talk a lot about air and water pollution, but we do not hear as much about pollution concerning sound. This is called noise pollution and it can have several negative effects. In communities where there is a lot of noise, people can have trouble sleeping. Their concentration at work can also be disturbed. Some communities even have ordinances against high levels of noise, with negative consequences for violating the ordinances.
Noise pollution is not as bad as air or water pollution.
Noise pollution is something about which we should be concerned.
People who have trouble sleeping should learn about water pollution.
People should talk about air and water pollution.
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