Indoor humidity has a significant effect on occupant comfort. Hygroscopic materials form a cushion for dampness in the same way that a heavy material is a cushion for temperature. This has been shown to provide significant improvement in perceived air quality. During longer periods - particularly in spring and harvest - as many as 25% more people will be satisfied in a bedroom with hygroscopic materials (Simonson, 2002). A moderate and stable moisture situation will also reduce the chances of mites and micro-organisms growing. The deposition and emission cycles of dust on inside surfaces will be reduced. Water vapour carries various gas contaminants combined with water vapour molecules (Simonson, 2000). Therefore, hygroscopic walls will even have a moderate air cleaning effect for nitrogen oxides and formaldehyde. This is only effective as long as the gases stay in the material or are broken down inside it.
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