Noise at 96 decibels is considered a moderate hazard. According to the size of the noise can be graded classification of noise, noise decibels in the range of 1 to 120 decibels can be divided into three levels. Level 1: 30 to 59 decibels, a relatively quiet and normal environment, when the noise exceeds 40 decibels, it will affect people’s sleep and rest, causing discomfort. Grade 2: 60 to 89 decibels, interfering with conversation, difficult to hear, while affecting work efficiency, and will cause interference with the vegetative nervous system. Grade 3: 90 to 120 decibels, is a serious sound pollution, long-term living or working in an environment of more than 90 decibels, will seriously affect hearing, causing irreversible damage to the auditory nerve, and may lead to the occurrence of other diseases.