The case study describes an industrial hygiene investigation initiated in response to a drilling rig down due to complaints of loud noise, workers decide to shut down one of three drilling rigs (P3: Drill 3) due to loud noise. It begins with the requirement of situational investigation of exposure to noise of the drilling workers in order to identify and evaluate the exposure to noise, for this the industrial hygienist performs a series of noise dosimetry detection, which aims to declare the results as acceptable or unacceptable based on current regulations, identify the characteristics of the noise sources under study and propose control measures in accordance with the fundamentals, communicate the fundamentals and controls to the workers and management. The study population is made up of drilling rig operators exposed to noise, population is 10 and the sample is 11, the methodology use...