The Occupational Epidemiological Survey Of Noise Exposed People Working In55Municipal Occupational Hazards Key Regulatory Enterprises At One City

ObjectiveDiscuss on the damage situation of occupational noise hazard in Kunshan, establish the initial data of Kunshan occupational noise hazard baseline, and analyze the damage trend from2009to2011, finally set up the noise hazard early warning mechanism of Kunshan.MethodsThis paper carried out a survey of55companies, where noise hazard exist, in150municipal occupational hazards key regulatory enterprises, which worked better at occupational hazards prevention aspects. Combined with on-site labor hygiene survey, job site noise hazard monitoring, and medical examination of noise practitioners, this paper obtained and analyze the noise hazard in the production process of these55companies, set up initial data of these55enterprises noise monitoring, and established information database of55enterprises noise exposed workers occupational health examination results. And then got the systematic collection of the occupational noise hazard status in Kunshan, created Kunshan occupational noise hazard baseline data.In case noise can mostly damage auditory system and cardiovascular system, the study is an analysis of noise on-site monitoring in the55companies from2009to2011, as well as the results of auditory test, and the incidence of hypertension and ECG abnormalities in noise exposed workers, and compared the trend in the three years. Thereby, current occupational noise hazard status and protective work in Kunshan was discussed, and problems found, then specific measures and implement improvements would be proposed. By the same time, combining the government, enterprises, service organizations was been investigated, to establish the future occupational noise management of enterprises in Kunshan, hoping to further improve the monitoring and management ideas of occupational noise in Kunshan enterprises.Results1.A total of563noise operating points were measured in55companies from2009to2011. The average noise exposure intensity of these3years was87.7,86.0,87.1dB (A) respectively. The different noise exposure intensity between2010and2009was statistically significant (P<0.05); the exceeded standard rate of these3years was65.0%,53.5%,58.5%, the difference of which was not statistically significant (P>0.05). The average noise exposure intensity differences of the3years between industries were not statistically significant (P>0.05); the machinery industry and wood furniture industry exceeded the standard level by64.7%,72.0%, which was the highest excess. Compared with other industries, the difference was statistically significant (P<0.05);in addition, the exceeded standard rates of noise exposure intensity in wood furniture industry changed every year, which were significantly higher trend in these3years.2.14,342people who exposured to noise of55companies in the three years2009-2011, a total examination exposure to noise post workers of, in which13,700people are survey, had physical examination. High-frequency hearing loss was53.8%o, speech frequency hearing loss was8.0%o, concentrated in Ⅰ～Ⅲ grade speech frequency hearing loss; in2011, the rate of high-frequency hearing loss, Ⅱ grade speech frequency hearing loss rate, compared with that in2009and2010, were significantly elevated, the difference was statistically significant(P<0.05). In wooden furniture industry high-frequency and the speech frequency hearing loss rate were101.6‰、32.5‰, the changes of hearing loss rate within three years were not statistically different (P>0.05);in machinery industry, high-frequency and speech frequency hearing loss rates were63.7‰、9.1‰, the loss rate showed an increasing trend in the three years, the difference was statistically significant (P<0.05); the three years overall high-frequency hearing loss rate in Shoes and hats industry was significantly higher than other industries, statistical difference was significance (P<0.05).3.Contact group hypertension prevalence rate was7.0%o, compared with the control group, the difference was not statistically significant (P>0.05); abnormal ECG results, including sinus bradycardia, sinus arrhythmia abnormal rate were126.4‰and50.3‰, compared with the control group, the difference was statistically significant (P<0.05), other abnormal results compared to the control group, the difference was not statistically significant (P>0.05).ConclusionsStrength of55industries noise exposure in2009-2011was " light noise hazard " in accordance with GBZ/T229.4-2012"Classification of occupational hazards at workplaces. Part4:Occupational exposure to noise", in which machinery and wooden furniture industries exceeded the rate significantly more than other industries, they were needed to strengthen the management of noise control; high-frequency, the Ⅱ level speech frequency hearing loss of noise contact staff in the55enterprises become more and more serious, especially machinery industry, in which more people were exposed to noise, so the hearing loss of them was the most serious, and strict governance to improve noise hazard situation in the industry is an urgent priority. The survey also finds that the degree of noise induced hearing loss in wood furniture industry was serious, the noise hazard management is needed to be strengthened to such industry. Meanwhile, despite the shoes and hats industry had a small number of enterprises, and less noise exposure staff, but the noise induced high-frequency hearing loss in shoes and hats industry was severe, which indicated that the noise control in this industry was ineffective, we cannot ignore the noise hazard management to such industry in our occupational health work. Investigation about noise induced cardiovascular system damage indicated that there were no significant abnormalities with the prevalence rate of hypertension in workers exposed to noise. Abnormal ECG results, compared with control group, there were significant differences in two damage results:sinus bradycardia and sinus irregularity. Prevention of noise hazard needs government, occupational health regulatory authorities, as well as laborers comprehensive management, joint efforts to carry out their duties, and work together to maintain the occupation health.