Volume 3, Issue 4 (Autumn 2014)                   JOHE 2014, 3(4): 233-241 | Back to browse issues page



DOI: 10.18869/acadpub.johe.3.4.233
PMCID: 0

XML Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Ahmadi Asour A, Gobabaei F, Nasiri P. A survey of the effect of toluene on the impact of noise on hearing loss in workers. JOHE. 2014; 3 (4) :233-241
URL: http://johe.rums.ac.ir/article-1-132-en.html

msc Department of occupational health, sabzevar university of medica science, Sabzevar ,IRAN , asour50@yahoo.com
Abstract:   (753 Views)

Background: Ototoxic chemicals can impair the sense of hearing and balance. In the past decades, the ototoxicity of solvents and their interaction with noise have become evident. This study has been carried out in the shoe manufacturing factory in Tehran (Iran) with the aim of evaluating the combined effects of noise and toluene on the workers' hearing.

Materials and Methods: This cross-sectional and analytical study was conducted on 64 workers selected through census. The participants were assigned to 3 groups according to their exposure to noise and toluene. Group 1 consisted of 33 workers who were exposed to noise, group 2 of 5 exposed to toluene, and group 3 of 26 exposed to noise and toluene. Toluene concentrations were measured in the workers' breathing zone as well as A-weighted sound pressure level (SPL), overall noise level (LpA) and equivalent continuous A-weighted SPL over 30 minutes, and the equivalent noise level A (LeqA) in the head position of workers. Then, the noise level was calculated and hearing thresholds were measured in 500-4000 Hz frequency range. The amounts of air and bone hearing loss were also calculated.

Results: The results indicated that the relationship between hearing loss caused by noise (group 1) and noise and toluene (group 3) were statistically significant (P < 0.50). Hearing loss due to toluene in midrange frequencies was more pronounced than in high frequencies.

Conclusions: The results of the study suggest that authorities should pay greater attention to agents such as noise which affect the hearing loss and health of employees, especially with respect to sensitivity of hearing system disorders. Moreover, individual characteristics should also be considered in employing future personnel.

Full-Text [PDF 452 kb]   |   Full Text (HTML)   (253 Downloads)    
Type of Study: original article | Subject: Occupational Health

Add your comments about this article : Your username or Email:
Write the security code in the box

© 2015 All Rights Reserved | Journal of Occupational Health and Epidemiology

Designed & Developed by : Yektaweb