The entry of soil gas volatile organic compounds (VOCs) into houses has been recognized as a contributing factor in the degradation of indoor air quality. Typically, houses which are affected by soil gas VOCs are situated in close proximity to hazardous lands, i.e. landfill sites, lands affected by contaminated groundwater plumes, hydrocarbon spills, etc. Although there are hundreds of evaluations carried out yearly to assess the impact of soil-gas VOCs indoors, very few studies typically address the VOC concentration variability over time or the factors which influence this variability.
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