Occupational noise exposure and its effects among mill workers: A narrative review

There are many possibilities for noise exposure in industrial workplaces, including sectors that extensively use heavy machinery in processing each product. Various studies indicate a causal relationship between noise exposure and auditory/nonauditory effects among workers. Noise exposure poses risks to health and workers' hearing acuity and safety. This review paper aims to identify and summarize occupational noise exposure by examining the auditory and nonauditory effects among mill workers. The mills included in the study are palm oil, lumber, textiles, rice, sugarcane, flour, paper, and sawmills. A two-step methodology was used to achieve the aims of this narrative review. The literature search was conducted by gathering PubMed and Google Scholar papers, focusing on occupational noise in different occupational mill environments. Grey's literature was conducted by screening the worldwide national standard for the laws, guidelines, and other related information based on this topic. A total of 22 articles published have been included. The content of each publication was subsequently summarized. Most of the machine areas within the mills emitted high level of noise. The auditory effects of occupational noise exposure among mill workers were noise-induced hearing loss and hearing impairment. Hypertension, stress, communication disturbance, cardiovascular disease, and headache were the nonauditory effects experienced by workers. The recommendations provided in this review for mitigating noise exposure are derived from the hierarchy of control. Overall, most mill workers are exposed to a high noise level exceeding the standard noise exposure limit. Preventive actions should be taken to address and reduce work-related injuries among mill workers worldwide.