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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2866

Authors: Gulelat, Teshome
Advisors: Dr Hameed Sulaiman
Professor Yalemtsehay Mekonnen
Keywords: Occupational noise
Hearing Conservation Program
Hearing Protection
Copyright: Mar-2010
Date Added: 10-May-2012
Publisher: AAU
Abstract: The problem of industrial noise around Addis Ababa was examined in this study. Noise measurement and survey was carried out at four factories (two textile and two metal processing) to assess the magnitude of occupational noise exposures of workers. A sample of 200 workers were selected randomly from each department and surveyed with questionnaires in order to determine the status of the working environment and safety practices at work. Parallel to this, measurement of occupational noise levels at the respective departments were done using digital sound level meter ( Bruel and Kjaer SL- 4001model) that meets IEC 651 type 2. The highest noise levels were documented in the planner machine room in the wood workshop unit and in the heat treatment sections (in the foundry department) of the Akaki Spare Part Share Company. The noise measurement also confirmed that out of the total 42 working sites surveyed, 24 of them (57.1%) prevailed significantly higher noise levels than NIOSH Recommended Exposure Levels(REL). All of the 19 working sites (100 %) in the metal processing factories and only five of the working stations out of twenty three (21.74 %) in the textile manufacturing factories fall under this category. This study also confirmed that 26.2% of working environments in these factories showed noise levels which exceed the Permissible Exposure Level (PEL) of 90dB(A) for eight hour exposure stipulated by OSHA and ILO. This group represents 4.35 % and 52.63 % of the surveyed working sites in the textile and metal processing factories respectively. The questionnaire and interview survey showed that only 23.8% of workers under noisy occupational environments were wearing HPDs (hearing protection devises). Thus, the study demonstrated that due to high noise levels of the occupational environments, especially in the metal processing factories, workers are exposed to a high risk of noise induced hearing loss and associated health threats. With regard to this, a hearing conservation program (HCP), which is a recognized method of preventing noise induced hearing loss in the occupational environment, is recommended to be implemented urgently in all the factories.
URI: http://hdl.handle.net/123456789/2866
Appears in:Thesis - Environmental Sciences

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