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Indoor air pollution in the GCC countries is a major health threat. People in the GCC countries spend a substantial amount of their time in indoor environments due to unfavorable meteorological conditions. In addition, production of physical and biological aerosols from air conditioners, cooking activities, burning of Arabian incense, and overcrowding due to pilgrimage programs are common causes of low quality indoor air in this region. Inhalation of indoor air pollutants causes mortalities and morbidities attributed to cardiorespiratory, pulmonary, and lung cancer diseases.