Which surfaces can be tested for dust sampling?

• A. Floors, window sills, and window wells/troughs
• B. Ceiling tiles and light fixtures
• C. Countertops and work surfaces
• D. Walls and doors

Answer: (A)

Dust sampling targets areas where lead-contaminated dust tends to accumulate and where people, especially children, are most likely to come into contact with it. The standard wipe-sampling surfaces—floors, interior window sills, and window troughs—are chosen because they capture dust that settles from deteriorating lead-based paint and from activities around windows. Floors collect settled dust that can be tracked around the home; interior window sills and window troughs gather dust that originates near painted window surfaces and can be disturbed by opening and closing windows or everyday handling. This combination provides a representative picture of the household’s lead-dust exposure risk and aligns with established sampling protocols.

Ceiling tiles and light fixtures, countertops and work surfaces, and walls or doors aren’t part of the standard sampling surfaces because they don’t consistently reflect the same contamination patterns or aren’t specified in the common dust-lead sampling methods.