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有人说,噪声是无形的健康大敌,这是有科学依据的。1955年,10名美国人为了一笔奖金,做超音速飞机噪音试验,结果都被噪声击毙。60年代初期,美国空军F104喷气飞机在俄克拉荷马市上空做超音速飞行试验,每天8次,飞行6个月后,农场的1万只鸭被轰鸣声杀死6000只。幸存的4000只也羽毛脱落或不生蛋,乳牛竟挤不出奶来。按国际标准,在繁华市区,室外噪声白天不能超过55分贝,夜间不应超过45分贝;一般居住区白天不应超过45分贝,夜间不应超过35分贝。多数科学家赞成,人类最适合的音量是在15～35分贝之间。
Some people say that noise is an intangible health enemy, which is scientifically based. In 1955, 10 Americans made a supersonic aircraft noise test for a prize, and the results were all shot by the noise. In the early 1960s, the U.S. Air Force F-104 jet-tailed supersonic flight over Oklahoma City was conducted eight times a day. Six months after the flight, 10,000 farmed ducks were roared to 6000. 4000 surviving feathers are also missing or not born, milk cows actually can not squeeze milk. According to international standards, outdoor noise should not exceed 55 decibels during the daytime and no more than 45 decibels during the daytime in the downtown area. The average residential area should not exceed 45 decibels during the day and 35 decays at night. Most scientists agree that the most suitable volume for humans is between 15 and 35 dB.