Using natural barriers like stone can result in higher indoor air quality, but there are a variety of factors involved in indoor air quality such that this one factor alone (building material) is not enough to ensure high indoor air quality. Ironically, the air we breathe inside buildings is often more polluted than the air outside. Some factors that contribute to poor indoor air quality are pollutant sources and inadequate ventilation. Stone, for example, can reduce pollutant sources by eliminating the need for drywall that may be covered in VOC emitting paints or susceptible to mold when wet. A comprehensive design approach, in which material selection is one key step, is necessary to secure higher indoor air quality.
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