A large number of people are living orworking in premises where ventilation isregulated and involved air conditioningsystems (Molinaet al.,1989). However,the problem was not limited to airconditioned buildings (Finnegan
et al.,
1987). Molina
et al
. (1989) showed that20% of the employees experiencesymptoms of SBS and most of them wereconvinced that this reduces their workingefficiency.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