Noise affects fetal development. A study conducted on infants born near airports reveals a higher incidence of congenital cleft lips. Infants born in noisy areas tend to weigh less, averaging around 2 kilograms. Noise also hinders the normal intellectual development of children. The intellectual development of children in noisy environments is 20% lower than that of children in quiet settings.

As aircraft noise levels increase, residents' distress intensifies. The impact of environmental noise varies by region. According to a survey in Japan, when noise in commercial areas reaches 55-59 decibels, in schools it's 50-54 decibels, and 45-49 decibels in educational institutions, 50% of residents report being affected by the noise. This noise level is considered the threshold for residents to complain about noise-related harm. The perception differs between day and night. A report by the UK Noise Commission indicates that outdoor noise at 50 decibels during the day and between 30-40 decibels at night triggers complaints from approximately 30% of residents due to distressing emotions. In residential areas, noise at 60 decibels elicits a significant number of complaints, while in industrial zones, the threshold is higher. The same 90-decibel noise causes more distress in offices than in workshops, and those particularly sensitive to noise may find it impossible to concentrate at 80-90 decibels.
Noise is one of the triggers for cancer. It can impair the normal immune function of the human body, rendering the immune system paralyzed, allowing cancer cells to thrive and ultimately lead to the development of cancer. To substantiate this claim, tumor research experts conducted animal experiments, keeping rats in environments with either no noise or high noise levels (with all other conditions being identical). After three months, only 7% of the rats in the noise-free environment developed cancer, while an astonishing 60% of the rats exposed to noise did.
Noise significantly impacts psychological activities, particularly evident in emotional responses. It can evoke feelings of excitement, restlessness, anxiety, and boredom, leading to distress. The distress caused by noise is influenced by both the physical characteristics of the noise and the psychological state of individuals.
The Organization for Economic Co-operation and Development (OECD) concluded after researching noise pollution that the average noise tolerance for humans should not exceed 65 decibels. The noise levels of household appliances we use at home are generally quite high. For instance, a fan ranges from 45 to 50 decibels; a washing machine from 60 to 80 decibels; a refrigerator from 30 to 40 decibels; a television from 50 to 70 decibels; a tape recorder at 80 decibels; a hair dryer from 50 to 60 decibels; an electric razor from 47 to 60 decibels... It is evident that merely turning on two appliances simultaneously can greatly surpass the indoor noise level standards in urban areas.