Consecative 3 Years Investigation on Hearing Loss Among Workers in Noise Exposure Workshop of An Electrolytic Aluminum Enterprise

Objective To understand hearing loss characteristics of workers working in the noise environ ment at an electrolytic aluminum enterprise's comprehensive workshop for controlling and eliminating occupational hearing damage.Methods Fifty six noise sites in the workshop were inspected and LAeg,8h was calculated according to the noise intensity,properties and workers exposare time.Combined with the results of 103 workers occupational health examination in consecutive 3 years,the characteristics of noise and hearing loss were analysed.Results One hundred and three workers were divided into 9 production posts.The high-frequency hearing damage was higher than speech-frequency hearing damage.Besides,hearing damage degree in working post with higher noise exposure was higher than that in working post with low noise exposure showing that there was dose-effect relationship between noise exposure level and hearing damage(r=0.994,P0.05).Hearing damage rate of workers working in the unsteady noise environment(85.71%)was higher than that of workers working in the relatively steady noise environment(24.72%).Conclusion Hearing loss caused by unsteady noise,high-frequency noise was more serious than that caused by steady-state and low-frequency noise.