## 2 Materials and Methods
### Employees' Experiences of Indoor Air Quality and Psychosocial Work Environment
\begin{table}
\begin{tabular}{p{142.3 pt} p{284.5 pt}} \hline \hline
**Categories** & **Main Criteria for Assessing Probability of Abnormal IA Exposure in Buildings.** \\ \hline \multirow{4}{*}{Unlikely} & No moisture or mould damage in structures. No air leaks from or through damaged structures. Ventilation system can be controlled by indoor pressure difference from the building envelope. Room acoustic materials and ventilation system have no man-made vitreous fibres (MMVF) sources. Indoor air quality corresponds to national reference values and guidelines set for the premises. \\ \hline \multirow{4}{*}{Possible} & Mould-damaged structure type is not widespread in building and repairs are easily definable (less than 1 m\({}^{2}\)). A few or single air leaks from or through damaged structures or from surrounding premises. Room acoustic materials or ventilation system have MMVF sources and fibres may end up in the indoor air or on surfaces.1 Concrete floor has extensive moisture, which can cause water vapour damage to permeable floor coating (emissions).1 Indoor air quality does not correspond to national reference values or the guidelines set for the premises, and an indoor air impurity source has been identified.1 \\ \hline \multirow{4}{*}{Likely} & Building or premises have widespread mould-damaged structure. Repairs are significant and affect a large part of the (one) structure of the building or premises, e.g., whole base floor structure. There is recurrent damage in the type of structure. Air leaks from or through damaged structures or from surrounding premises and moisture or mould-damaged materials are regular and recurrent in the structure, occasionally there is negative pressure in the premises and/or air-tightness is risky. Indoor air quality does not correspond to national reference values or the guidelines set for the premises, and an indoor air impurity source has been identified.1 Creosote has been used in the structure and air leaks into the indoor air from the structure. There is also a notable smell of creosote (e.g., naphthalene) in the indoor air.1 \\ \hline \multirow{4}{*}{Very likely} & The building or premises has a great deal of extensive mould damage in several structures. The extent of repairs is significant and affects several structures in the building or premises e.g., whole facade and whole base floor. There is recurrent damage in the type of the structures. Air leaks from or through damaged structures are regular and recurrent, negative pressure is significant in the premises and/or air-tightness is very risky. Indoor air quality does not correspond to national reference values or the guidelines set for the premises, and an indoor air impurity source has been identified.1 Creosote has been used in the structures and air leaks into the indoor air from the structures. In addition, concentrations of polycyclic aromatic hydrocarbons (PAH) or separate components exceed the set national values and guidelines.1 Dust sample tests have found asbestos fibres in the premises, and the pollution source has been defined.1 Indoor radon concentrations exceed the set national values and guidelines (400 Bq/m\({}^{3}\)[26]).1 \\ \hline \hline \end{tabular}  
* 1 The assessment must take into account the extent and impact of the problem and impurity source.  
\end{table} 
Table 1: Main criteria and categories for assessing probability of abnormal IA exposure in buildings. the probability of abnormal IA exposure assessment had already been performed. The employees did not know the results of the assessment prior to responding to the IA questionnaires. This is a questionnaire-based study, in which participation was voluntary and performed no intervention on individuals, according to Finnish legislation it did not require ethics committee handling.