A large number of people are living or working in premises where ventilation is regulated and involved air conditioning systems (Molinaet al.,1989). However,the problem was not limited to airconditioned buildings (Finnegan
et al., 1987). Molina et al. (1989) showed that 20% of the employees experience symptoms of SBS and most of them were convinced that this reduces their working efficiency.Other report estimates that up to30% of new refurbished buildingsthroughout the world may be affected bythis syndrome (WHO, 1986). Molina
et al
.(1989) also stated that in a studyperformed in UK on 4373 of officeworkers in 46 buildings, 29% of themexperienced five or more of thecharacteristic symptoms of sick buildingsyndrome