In this study, noise perception misconception of shift workers was investigated. For this purpose, it has been tried to determine the noise intensity perception response of the employees night and day shifts in the bran storage and crude oil unit of Sunar Mısır Integrated Facilities within Sunar Group. For this, noise intensity measurements were made at the boarding the bus and arrival points (outdoor environment) and bran storage/crude oil unit (indoor environment) where those working in day and night shifts are exposed to noise. It has been evaluated that the different noise intensity that the employees are exposed to during the day and night in the external environment causes a false perception and the negative effects of this on the employees. As a result, it has been observed that night shift workers work with headphones because they correctly perceive the noise intensity differences between the outside environments and the indoor environments, 16.67 dB and 15.67 dB, respectively. However, it was determined that those working in the day shift could not perceive the difference in noise intensity sufficiently, so they worked without using headphone. For this reason, all necessary precautions should be taken to protect of the ears with earplugs or headphones, especially for day shift workers. In addition, conveying auger, silo ventilation fans, press and debarking machines that cause noise in the indoor environment should be improved or replaced with new ones