The impact of noise pollution on human health presents multiple systematic and progressive damage characteristics. Long term exposure to noise levels above 85 decibels can cause irreversible damage to the hair cells in the inner ear. Clinical data shows that exposure to 115 decibels of noise for 15 minutes can cause temporary hearing threshold shift, and continuous exposure will develop into deafness. This type of hearing loss has a cumulative effect. According to statistics from the World Health Organization, approximately 1.1 billion people aged 12-35 worldwide are at risk of hearing loss due to entertainment noise, resulting in economic losses of up to $750 billion annually. The cardiovascular system is also seriously threatened. Noise stimulation will lead to increased blood pressure and heart rate disorder. Epidemiological survey shows that every 10 decibels increase in traffic noise will increase the incidence rate of myocardial infarction by 12%.

The damage to the nervous system and mental health is more concealed. Continuous noise interference can cause an imbalance between cortical excitation and inhibition, leading to symptoms such as insomnia and memory decline. People working in a 70 decibel noise environment are 3.2 times more likely to experience neurasthenia than those working in a quiet environment. Children are particularly vulnerable, and classroom noise exceeding 55 decibels can reduce learning efficiency by 30%. Long term exposure may also lead to delayed intellectual development and language deficiencies. More seriously, noise disrupts the endocrine system by stimulating the hypothalamic pituitary adrenal axis, causing abnormal levels of stress hormones such as cortisol, which in turn triggers anxiety and depression.

Noise pollution also causes widespread physiological dysfunction. The 60-80 decibel noise generated by kitchen equipment significantly increases the risk of digestive system diseases, while sudden noise at night, even as low as 40 decibels, can interrupt sleep cycles and lead to a 27% decrease in cognitive function the next day. The physical examination report of workers in the industrial noise area showed that their immune function indicators were 40% lower than those of the normal population, and the incidence rate of malignant tumors was 2.3 times higher, which confirmed that noise would weaken the immune surveillance function. These health damages have a dose-response relationship, and for every 3 decibels of noise exposure, the human body needs twice the time to restore physiological balance.