Industrial noise power and workers hearing level / Шинэ санаа Шинэ нээлт

ABSTRACT

Effects of industrial noise have been recognized by humanity since mid 19th century and works to study and prevent industrial noises had begun globally. Strong industrial noises damage human internal ear and hair cell of cort-organ rapidly and gradually, which causes deafness; and thousands of people are suffering from health problems. Many noisy industries, where thousands of people work, were built in our country by 1960’s anddeafness has increased due to exposure of industrial noise. Scientific studies to measure the level of industrial noise, to determine the hearing level of people who are working in it, to study the relationship between noise and hearing loss still haven’t been conducted completely. Aim: To measure distribution zone of industrial noise generator which generates noise with more than 85, to study hearing threshold of the people who are constantly affected by it, to prevent noise hearing loss.The plants of “Erdenet Industry” JSC, TPP-4 SOC, “Darkhan TU” SOC, TPP-3 SOC have been chosenwithin scope of the research. Noise level of 42 instruments of these plants which produces noise over85 “Noise distribution zone” where noise level decreases to 85, Chose 480 employees who have beenaffected by it for more than 5 years.Using modern audiometer at 250, 500, 1000, 2000, 4000, 8000 Hz to measure for each bone and air conduction in noise-proof rooms Average hearing thresholds are calculated at dense, medium, pitched noise levelEarplug and headphone were used at shop and assembly line with noise over 85 дБ for more than 24 hours by employees, their satisfaction was studied and it was watched that if they were using the protective equipment regularly.Hearing threshold of employees who constantly work at noisy environment found to be 28.5±3.8 dB atdense noise 31.8±4.4±0.3 at medium noise, 38.2±5.7 dB at pitched noise level for “Erdenet Industry” JSC, 30.9±3.1±0.3 дБ at dense noise, 34.6±3.5 dB at medium noise, 39.5±4.3 dB at pitched noise level for TPP-4 SOC, 31.9±3.6 dB at dense noise, 34.9±3.8 dB at medium noise, 40.9±4.1 dB at pitched noise level for “Darkhan TU” SOC, 28.9±2.6 dB at dense noise, 32.4±2.8 dB at medium noise, 36.4±4.4 dB at pitched noise level for TPP-3 SOC. 95.6% of employees of “Erdenet Industry” JSC, 95.7% of employees of TPP-4 SOC, 96.5 % of employees of “Darkhan TU” SOC, 95.8 % of employees of TPP-3 SOC were satisfied when noise protection tools Ear classic and Bilsom were used at environment with noise level over 85 dB. Average hearing threshold of employees who have worked for more than 5 years in weak industrial noise level (85 – 92.5 dB) found to be 28.4±3.0 dB at dense noise, 32.3±3.2 dB at medium noise, 37.1±4.5 dB at pitched noise level, for medium noise level environment 30.2±3.4±0.3 dB at dense noise, 33.5±4.0 dB at medium noise, 39.2±4.4 dB at pitched noise level, for strong noise environment 34.1±3.6 dB at dense noise, 34.5±3.8±0.4 at medium noise, 34.8±4.5 dB at pitched noise level, or it was reduced from healthy hearing threshold with true possibility when p=0.05.95.6% of employees of “Erdenet Industry” JSC, 95.7% of employees of TPP-4 SOC, 96.5 % of employees of “Darkhan TU” SOC, 95.8 % of employees of TPP-3 SOC were satisfied when noise protection tools Ear classic and Bilsom were used at environment with noise level over 85 dB, which makes these tools reliable protectors from hearing loss due to noise.