据报道,近30年来一些工业发达国家,城市噪声级增加30分贝,平均每年升高1分贝。按声能计算,每三年城市环境噪声的声能增加一倍,增加30分贝相当声能增加1000倍。可见噪声污染的增加速度之快。国内一些城市噪声污染的现状也表明,近代噪声已发展到严重地影响人们工作、学习、休息以及日常的社交活动,并危及人们的健康。 According to reports, in some industrialized countries in the past 30 years, the noise level of cities has increased by 30 decibels, an average of 1 decibel per year. Acoustic energy calculation, urban environmental noise every three years, the sound energy to double, an increase of 30 dB sound can increase 1000 times. It can be seen that the noise pollution increases rapidly. The current situation of noise pollution in some cities in China also shows that modern noises have been developed to seriously affect people’s work, study, rest and daily social activities, and endanger people’s health.