The numerous and intense sounds of the city cause unpleasant sensations in people. Sounds are generated from fixed or moving sources and propagate in all directions. The degree of discomfort of some sounds depends on their duration and intensity. The intensity level is measured in decibels and this measurement scale goes from 0 for barely audible sounds to 120 or more for sounds that cause pain and discomfort to the human auditory system . The harmful effects of sounds are known as noise pollution, also called noise pollution.
The measurement of noise pollution from some everyday sounds
The instrument used to measure the effects of sound on health is the sound meter. This device has a microphone that picks up sound signals and its internal circuitry processes the sound. Loudness levels can be observed on a screen. In this way, a gentle breeze that moves the leaves of a tree produces 10 decibels, a normal conversion at close range produces 60 decibels, urban traffic of normal intensity generates 80 decibels, in a ballad 100 decibels are reached and a plane takes off. about 120 decibels. Noise pollution
The philosophy of the auditory system and the resistance of the human ear
Sound waves penetrate our ear through the ear canal. This channel ends at the eardrum, a membrane attached to the middle ear. In the middle ear there is a system of levers formed by three small bones (hammer, incus and stapes) that connect to the inner ear. In this part of the auditory system are the semicircular canals that regulate the sense of balance. On the other hand, the cochlea is located in sensory cells that activate the electrical signals that inform the brain about sounds. Noise pollution
External noise affects the receptor cells of the ear
If the noise is intense, the cells can deteriorate or even lose function , causing deafness. It should be noted that the number of sensory cells is determined at birth and that they do not renew. Consequently, the damage suffered by these sensory cells is irreparable. Noise pollution
Hearing losses are assessed through audiometry, a method in which the patient is exposed to sounds of various frequencies and an audiogram that records the results obtained.
Hearing pollution in some cities exacerbates age-related natural hearing loss. The exhibition continued to noise seriously affects the hearing, and the longer the exposure, the greater the consequences our hearing ability.