Indoor environmental quality (IEQ) is one of the most important factors that affect the residents of the indoor locations. CO2, CO and thermal comfort is the most famous parameters, and IUG is considered as a leader in the pursuit of providing satisfaction for workers. This study aims to identify the impact of the elements of indoor environmental quality on the employees of IUG and to compare these elements with the international recognized standards. This study was conducted on 22 rooms within IUG, where employees spend more 7 hours in their offices during three seasons: winter, and summer, in two stages, the first stage: field work, by measuring the concentration of CO2, CO, Humidity and temperature by using the relevant devices, the second stage: designing a questionnaire for exploring the extent of the impact of The study shows the following results: 80% of IUG employees are satisfied with thermal comfort and the concentration of CO is appropriate and less than the standards (9ppm). CO2 is high in the rooms that rely on centralized air conditioning, and there is a negative relationship between the ventilation ratio and the concentration of CO2. There is a significant statistical difference between CO2 measurements according to seasons these factors on the employees working indoors. The university employees felt the symptoms of health issues related to carbon dioxide concentration. The study concluded that CO2, CO concentrations are varied inside the rooms of the university and the environmental awareness of these factors and their effect need to be enforced
