Saturday, April 11, 2020

What is the noise pollution


Welcome to the global web. Today, in this article, I will tell you and discuss the information about what is the noise pollution

Acoustic pollution:
 sonic pollution or noise pollution is the excess sound that alters the normal conditions of the environment in a certain area.
Although noise does not accumulate, move or last over time like other pollution, it can also cause great damage to people's quality of life if it is not controlled. The term «noise pollution» refers to noise (understood as excessive and annoying sound), caused by human activities (traffic, industries, entertainment venues, airplanes, boats, among others) that produce negative effects on hearing, physical health and mental of living beings. Noise measurement to measure the impact of environmental noise (noise pollution), several indicators are used that are in continuous development, starting from LpSound pressure level, LpEquivalent continuous sound pressure level, (Leq, T)

What is the noise pollution

Hearing value:
The sound pressure level is defined as 20 times the logarithmic ratio of the effective sound pressure with respect to a reference pressure p0, with a value of p0 = 2.0 × 10-5 N / m² = 20 μPa, obtained by means of a normalized weight of frequencies and a normalized exponential weighting of times.

If they are not explicitly mentioned, it should be understood that this is the FAST time weighting and the A frequency weighting, adopting the following LpA nomenclature. Equivalent continuous sound pressure level (Leq)
It is defined as the pressure level that contains the average energy of a fluctuating noise for the same period of time. [Appointment required or Sound Exposure Level
SEL is the LEQ level of a noise lasting 1 second. The SEL is used to measure the number of times tolerated noise levels are exceeded in specific places: residential neighborhoods, hospitals, schools, etc.
LAMAX
It is the highest A-weighted equivalent continuous sound pressure level, in decibels, determined over a time interval of 1 second (LAeq, 1) recorded in the time evaluation period.
DB is the unit used to measure sound intensity and other physical quantities. It is the tenth part of a bel B, a unit that receives its name from Graham BellHearing Effects
The hearing system suffers from prolonged exposure to a sound source, even if it is a low level.
The auditory effect caused by environmental noise is called socioacusia. When a person is exposed for a long time to an excessive sound level, he notices a constant whistling in the ear, this is a warning signal. Initially, the damage caused by prolonged exposure is not permanent, after 10 days they disappear. Hearing will be lost until it becomes deaf.
Not only is prolonged noise detrimental, a sudden sound of 160 dBA, like that of an explosion or a shot, can end up perforating the eardrum or causing other irreversible injuries. Promptly citing the auditory affections that noise produces we have: Temporal and Permanent Displacement of the hearing threshold.
Temporary threshold shift (TTS)
It consists of an elevation of the threshold produced by the presence of a noise, with total recovery after a period, as long as the exposure to it is not repeated. It usually occurs during the first hour of noise exposure. This can cause pupil dilation, fatigue, headache, etc. Interference in oral communication
Communication intelligibility is reduced due to background noise. The ear is a transducer and does not discriminate between noise sources, the separation and identification of sound sources occurs in the brain. As is already known, the human voice produces sound in the range of 100 to 10,000 Hz, but the verbal information is in the range of 200 to 6000 Hz. The frequency band determined for speech intelligibility, that is to say, understand word and phrase, it is between 500 and 2500 Hz. Interference in oral communication during work activities can cause accidents caused by the inability to hear warning calls or other indications. In offices such as schools and homes, interference with conversation is a major source of discomfort.

What is the noise pollution

Hearing Effects:
Over the years, noise pollution has become a health problem. For this reason, the industry has increased its efforts to reduce the emission of noise from specific sources. An option to facilitate this determination of noise in said sources is locating the point where the greatest amount of sound energy is generated. Noise pollution, in addition to affecting the ear, can cause negative psychological and other pathophysiological effects.
Of course, noise and its non-auditory negative effects on behavior and mental and physical health depend on personal characteristics, apparently, the stress generated by noise is modulated depending on each individual and each situation.
Psychopathological effects
At more than 60 dBA.
Pupil dilation and rapid blinking.
Respiratory agitation, acceleration of the pulse and tachycardias.
Increased blood pressure and headache.
Less blood supply and increased muscle activity. The muscles become tight and painful, especially those of the neck and back.
At over 85 dBA.
Decreased gastric secretion, gastritis, or colitis.
Increased cholesterol and triglycerides, with the consequent cardiovascular risk. In patients with cardiovascular problems, arteriosclerosis or coronary problems, loud and sudden noises can even cause a heart attack.
Increases glucose in the blood. In diabetic patients, a continuous 
rise in blood glucose can cause long-term medical complications

What is the noise pollution

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