###### Abstract  
Indoor air problems are complicated and need to be approached from many perspectives. In this research, we studied the association of four-level categorisation of the probability of abnormal indoor air (IA) exposure with the work environment-related symptoms, group-level health information and psychosocial work environment of employees. We also evaluated the multiprofessional IA group assessment of the current indoor air quality (IAQ) of the hospital premises. We found no statistical association between the four-level categorisation of the probability of abnormal IA exposure and the employees' perceived symptoms, health information, and perceived psychosocial work environment. However, the results showed a statistical association between perceived symptoms and man-made vitreous fibre sources in ventilation. Furthermore, extensive impurity sources in the premises increased the employees' contact with health services and their perceived symptoms. The employees perceived stress and symptoms in all categories of abnormal IA exposure, which may be related to IAQ or other factors affecting human experience. Prolonged process management may influence users' experiences of IAQ. The results suggest that an extensive impurity source in premises does not always associate with the prevalence of perceived symptoms. We conclude that indoor air questionnaires alone cannot determine the urgency of the measures required. perceived indoor air quality; building research; indoor air questionnaires; psychosocial work environment; categorisation; ventilation; mould; moisture; man-made mineral fibres +
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IAQ problems are often the result of many different factors and their interaction or complex combination. In addition to moisture and mould damage, several other factors and their interactions, such as material emissions [5], ventilation deficiencies [6], system impurities [7], outdoor and soil impurities [8], human activities in the premises [9], IA temperature, and dry air [10] can cause IAQ problems. Office-type buildings have no established measurement methods for all IA pollutants, and no health-based limit values for most of them [2; 11]. Several IA pollutant sources can cause symptoms and harm to the users of premises. A recent review concluded that the greater the presence of moisture and mould damage in the premises, the greater the risk of respiratory health effects [11]. Man-made vitreous fibres (MMVF) in the ventilation system may cause upper respiratory irritation and skin symptoms among users of the premises [5; 12; 13; 14]. Volatile organic compounds (VOC) from building materials may cause sensory irritation [5; 7]. IAQ problems may also affect sick leaves and work efficiency [15]. It has been estimated that predictive property management reduces the IAQ-related symptoms of premises users [16], and some evidence shows that repairing moisture and mould damage and removing contaminants from buildings can reduce respiratory symptoms [17; 18] and improve work efficiency [19]. In addition to IAQ factors, several other factors at workplaces, such as stress, poor cooperation, heavy workload, and individual factors may also affect perceived IAQ and play a role in IAQ problems [20; 21]. These problems should be examined from a wider perspective, and experience of the users of the premises and the psychosocial environment should be considered [20; 21; 22; 23]. It has been suggested that good practices for solving complex or prolonged IAQ problems are well organised and involve long-term multiprofessional cooperation between experts [23; 24]. The aim of this study was to test the use of the holistic approach in determining the urgency of the measures required from the perspective of building health.