1, noise damage to hearing
The most direct harm of noise on the human body is hearing damage. When people enter a strong noise environment, exposure for a period of time, will feel the ears difficult, and even headaches and other feelings. If you leave the noise environment and rest for a while in a quiet place, your hearing will gradually return to normal.
2, noise can induce a variety of diseases
Because the noise through the auditory organs in the central nervous system of the brain, so as to affect all organs of the body, so the noise in addition to human hearing damage, but also to the human body will bring harm to other systems. Because of the role of noise, will produce headache, brain swelling, tinnitus, insomnia, general fatigue and memory loss and other symptoms of neurasthenia.
3, in addition, the noise on the visual organs, endocrine function and the normal development of the fetus will also have a certain impact. People working and living in high noise, the general health level declines year by year, the resistance to disease is weakened, induced some diseases, but also and individual physical factors, can not be generalized.
Prevention of noise
In order to prevent noise, China's famous acoustician Prof. Ma Dayou has summarized and studied the hazards and standards of various types of noise available at home and abroad, and put forward three suggestions:
(1) In order to protect people's hearing and health, the permissible value of noise is 75 to 90 decibels.
(2) To safeguard conversations and communication links, the permissible value of ambient noise is 45 to 60 decibels.
(3) For sleeping time, 35~50dB is recommended.
Reference: Baidu Encyclopedia - Noise Pollution