Noi se level can be quantified and qualified based on sound characteristics such as intensity, type of spectrum, duration and distribution of the noise exposure during one's working hours.Objective: To assess noise spectrum and the audiometric configuration of workers. Materials and Methods:Contemporary cross-sectional cohort carried out in the Federal DistrictBrazil. We did an environmental analysis (spectral analysis) of the noise in companies from different industries, with audiological assessment of 347 workers. Results:The spectral analysis revealed peaks at different frequencies for each industry investigated (8 kHz-metallurgical, 4 kHz-stone Works and 2 kHz-wood works). We noticed that the frequencies of 14 kHz and 16 kHz had significant differences between the various industries, with a greater prevalence of the metallurgical. Conclusion:The use of noise pressure measuring device, coupled to a frequency analyzer and high frequency audiometric assessment yielded an early detection of hearing damage, helping better organize preventive measures. Braz J Otorhinolaryngol. 2012;78(4):108-14. ORIGINAL ARTICLE
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