Epidemiology of Occupational Noise Exposure Level in the Industries of Bhutan
Abstract
Introduction: Noise hearing loss has been long recognized as an occupational disease which is preventable. The health effect of noise exposure depends on the level of noise and the duration of exposure. Thus, understanding noise levels and determining workers’ exposure to different noise levels at workplace is paramount in determining preventable programs at workplace. However, in Bhutan, there is limited or no information or studies on the prevalence of noise exposure level in the industries.
Methods: The objective of this article is to ascertain the level of occupational noise exposure in the 26 manufacturing industries in two state of Bhutan and determine the high-risk industry and occupation. Sectors with high risk of noise exposure were selected for the study and similarly, the departments with high noise pollution within the establishment were considered for sampling. The level of noise was measured using NIOSH SLM apps on iOS devices and structured forms were used.
Results: 34.6% of industries have occupation noise level between 85 to 90dB(A) and 38.5% have above 91dB(A). By occupation, 43.5% of workers are exposed to occupational noise level more than 90dB(A). Among various occupations, carpenters and operators are found to be vulnerable to hearing loss.
Conclusion: Since more than one third of the enterprises have occupational noise level exceeding 90 dB(A), the workers in these workplaces have a higher risk of hearing loss. The situation could be further aggravated due to not using ear protection and not having hearing conservation programs in these workplaces.
References
Celestina M, Hrovat J, Kardousb CA. Smartphonebased sound level measurement apps: Evaluation
of compliance with international sound level meter standards. Applied Acoustics 2018; 139: 119-128.
Dendup P, Dukpa DP. Occupational health and safety practices and challenges in the construction industry
of Bhutan: a situation analysis. International Journal of Scientific and Research Publications 2018; 7(10): 3-14.
Dendup P. Human, Organizational Factors (HOF) and workplace accidents among the Ferroalloy industries in
Bhutan. Int J Preven Curat Comm Med 2017; 3(3): 7-22.4. Fuente A, Hickson L. Noise-induced hearing loss in Asia.
International Journal of Audiology 2011; 50(sup1): S3-10.
Health and safety in construction sector in Great Britain, 2014/15. HSE. 2016. Cited March 2017. Available
from: http://www.hse.gov.uk/statistics/industry/construction.
HSE. Noise-Induced Hearing Loss (NIHL) in Great Britain 2016. 2017. Available from: http://www.hse.gov.uk/
statistics/causdis/deafness/index.htm.
Juathaisong Y, Chapman SR. Hearing loss in relation to occupational noise levels among workers in a polyester
fiber factory in Thailand. Journal of Health Research 2015; 29(2): 215-221.
Kim YS, Cho YH, Kwon OJ et al. The risk rating system for noise-induced hearing loss in Korean manufacturing
sites based on the 2009 survey on work environments. Safety and Health Work 2011; 2(4): 336-347.
Le TN, Straatman LV, Lea J et al. Current insights in noise-induced hearing loss: a literature review of the
underlying mechanism, pathophysiology, asymmetry, and management options. Journal of Otolaryngology
- Head & Neck Surgery 2017; 46(1): 41.
Lutman ME. What is the risk of noise-induced hearing loss at 80, 85, 90 dB(A) and above? Occup Med (Lond)
; 50(4): 274-275.
Masterson EA, Tak S, Themann CL et al. Prevalence of hearing loss in the United States by industry. American
Journal of Industrial Medicine 2013; 56(6): 670-681.
Ministry of Health. Annual Health Bulletin 2017. 13. Nandi SS, Dhatrak SV. Occupational noise-induced
hearing loss in India. Indian Journal of Occupational and Environmental Medicine 2008; 12(2): 53-56.
Nelson DI, Nelson RY, Concha-Barrientos M et al. The global burden of occupational noise-induced hearing
loss. American Journal of Industrial Medicine 2005; 48(6): 446-458.
NIOSH. Occupational Hearing Loss (OHL) Surveillance 2017. Available from: https://www.cdc.gov/niosh.
Prendergast G, Guest H, Munro KJ et al. Effects of noise exposure on young adults with normal
audiograms I: Electrophysiology. Hearing Research 2017; 344(Supplement C): 68-81.
Sriopas A, Chapman RS, Sutammasa S et al. Occupational noise-induced hearing loss in auto part factory workers in welding units in Thailand. J Occup Health 2017; 59(1): 55-62.
Tantranont K, Srisuphan W, Kaewthummanukul T et al. Factors affecting Thai workers’ use of hearing
protection. AAOHN Journal 2009; 57(11): 455-463.
WHO. Hearing loss due to recreational exposure to loud sounds; a review. 2015.
Yongbing S, Hal Martin W. Noise induced hearing loss in China: a potentially costly public health lssue. Journal of Otology 2013; 8(1): 51-56.
