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Abstract
Settled dust found in indoor environments may contain various toxic pollutants, posing potential health risks to the occupants through inhalation, ingestion and dermal contact. Accurate measurement of settled dust level in residents can reduce uncertainties in exposure assessment. This study presents a sampling methodology that can provide direct measurement of total surface loading and size distribution for settled dust on different type of floorings. The sampling methodology (HVS3-MOUDI) is comprised of a HVS3 vacuum (CS3,Inc.) and a six-stage cascade impactor (MOUDI™) that measures the size distribution for particles range between 0.56 µm to 10µm. The methodology was validated using deposit with known surface loading and size distribution. This study compared the sampling efficiencies of the sampling methodology and the standardized micro-vacuum sampling method (ASTM D7144) on carpets and vinyl floorings. Field samplings were conducted using the sampling methodology in 20 houses among Potsdam, NY. Preliminary results showed that carpets were associated with higher settled dust level in comparison of hard floorings.
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