Affiliations 

  • 1 Universiti Sains Malaysia (USM), Kubang Kerian, Kelantan
MyJurnal

Abstract

Introduction: Rapid ongoing industrialisation particularly in developing countries has triggered an
increased risk of occupational noise-related disease occurrence. Machinery and work tasks in metal fabrication
processes may produce high noise levels that can be harmful to hearing. This study aimed to investigate the
workers’ exposure to noise at a fabrication plant and their perceptions toward hearing loss symptoms and its association.
Methods: This study was conducted at a Heating, Ventilating and Air Conditioning fabrication plant in Johor.
With a 31% response rate, 50 respondents who were selected using purposive sampling answered a
questionnaire regarding demographic background, noise exposure and perceived hearing loss symptoms. Noise
measurements were also conducted among 30 of them based on the concept of sampling the maximum
risky workers. The noise was measured using a sound level meter IEC 60651 Class 2. Minimum (Lmin)
and maximum (Lmax) sound pressure levels were measured for 5-minute and repeated for three exposure
periods (morning, afternoon, evening). Results: 68% and 32% of the workers were 20-30 years old and had
been employed for 3-5 years, respectively. Average noise exposure level observed was 63.3-101.5 dBA. 25%
of the workers reported that they were sometimes experienced the symptoms of hearing loss. These include
difficulty in understanding conversation and ringing in the ear. However, noise exposure and hearing loss
symptoms were not significantly associated. Conclusion: The study findings suggest that the workers have a risk
of developing hearing loss. Intervention programme and enforcement on hearing protection of the workforce
are highly recommended.