Decibel is a unit of measurement to measure the proportion of two identical units, which is mainly used to measure sound intensity, and is often expressed in dB. Decibel originated from the measurement of long-distance telecommunications, and was widely used in the fields of electrician, radio, mechanics, shock vibration, mechanical power, acoustics and so on.
The influence of high decibel on people;
1, the World Health Organization research shows that when indoor noise pollution exceeds 30 decibels, people's normal sleep will be disturbed, while living in a noise environment above 70 decibels will affect people's hearing and health.
Noise is harmful to human health in many ways. What is easy to be concerned about is the damage to hearing, which causes ear discomfort, such as tinnitus, earache and hearing loss. If you live in a noise environment above 80 decibels, the number of deaf people can reach 50%.
3. Noise can also damage cardiovascular system and nervous system. Patients with coronary heart disease live in noise for a long time, especially at night, and the incidence of myocardial infarction will increase.