In today's world, almost everyone knows that air pollution and water pollution are harmful to people. However, not all people know that noise is also a kind of pollution and it is harmful to human beings too.
People who work and live under noisy conditions easily become deaf. Scientists believe that 10 percent of the workers in Britain are being deafened (变聋) by the noise where they work. Many of the workers who print newspapers and books, and who weave (织) cloth become deaf. Quite a few people living near airports also become deaf, Recently it was discovered that many teenagers in America could hear mo better than 65 year old people. for these young people like to listen to pop music and most of the pop music is a kind of noise.
Nowadays the governments in many countries have made laws to reduce or control noise and to make it less than 85 decibels (分贝). In China, the government is trying to solve not only air and water pollution problems but also the noise pollution problem.
