Which surface is not tested for dust sampling?

• A. Window wells
• B. Floors
• C. Ventilation ducts
• D. Window sills

Answer: (D)

Dust sampling targets surfaces where lead dust is most likely to accumulate and be ingested, so the testing focuses on areas that reliably reflect overall indoor dust burden. Floors capture the most dust brought in from daily activities and are a primary target. Ventilation ducts and areas like window wells collect dust that moves with indoor air and settles in less disturbed spots, offering a broader picture of what might be spreading through the home.

Window sills, while they can hold dust, are not part of the standard dust wipe sampling protocol in this context because sampling there tends to be more variable and less representative of the general indoor dust load. They are often inspected for paint presence rather than used as a routine measure of dust contamination. So, among the surfaces listed, window sills are not tested for dust sampling in this framework.