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ZJRMS 2008, 10(4): 0-0 Back to browse issues page
The Effects of Noise Pollution and Hearing of Metal Workers in Arak
Reza Tajic , Ahmad Ghadami , Farhad Ghamari
Abstract:   (20320 Views)

Background: Noise exposure and subsequent hearing loss are important problems in metal industry. The aim of this study was to determine the prevalence of noise induced hearing loss (NIHL) and other risk factors associated with industrial noise exposure among metal workers in a metal factory in Arak.

Materials and Methods:In this cross-sectional study, 743 metal workers who were exposed to noise were involved. The environment noise was measured using both sound level meter according to standards presented by national association of occupational health of Iran and ACGIH and ANSI. Audiometry was used to assess the hearing loss in each worker according to ISO-85 standard.

Results:Of 1191 station points that sound pressure level was measured there, 224 points (18%) were above the permissible level of 85 dB. In 967 points (82%), sound pressure level was in precaution range (65<SPL<85). The sound pressure levels in all stations in compact-air units were above the permissible level. The results of audiometry tests indicated that the greatest prevalence of hearing loss was found in workers in sheeting, assembling and welding units (10%, 8.1%, and 7.3% respectively). The greatest NIHL were found in workers between 41 to 50 years old and in workers who had a history of 21-30 years working. The multivariate analysis showed that severity of noise, age, history of working and days of working in the week were risk factors for NIHL (p<0.05).

Conclusion: Our findings indicated that the prevalence of noise induced hearing loss was high among workers of a metal factory in Arak.

 

Keywords: Key words : Noise pollution, Arak metal factory, NIHL, Age, Working years
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Tajic R, Ghadami A, Ghamari F. The Effects of Noise Pollution and Hearing of Metal Workers in Arak. ZJRMS. 2008; 10 (4)
URL: http://zjrms.ir/article-1-368-en.html
Volume 10, Issue 4 (Dec 2008) Back to browse issues page
Zahedan Journal of Research in Medical Sciences
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