Which statement about dust sampling surfaces is true?

• A. Dust sampling is not limited to floors or windows
• B. Dust sampling is allowed on floors, window sills, and window wells/troughs
• C. Dust sampling can only be conducted on ceilings
• D. Dust sampling requires testing only one surface

Answer: (B)

Dust sampling targets surfaces where lead dust tends to accumulate and where people can become exposed. Floors, window sills, and window wells or troughs are standard sampling surfaces because each area captures different routes of dust deposition: floors collect tracked-in dust from everyday activity, window sills gather dust that settles from interior paint chips or outdoor dust blown inward, and window wells/troughs can harbor dust near windows from exterior sources. Sampling multiple surfaces provides a fuller picture of potential exposure, whereas testing only one surface could miss elevated dust on others. Ceilings are not typical targets for this type of wipe sampling, so the statement that dust sampling is allowed on floors, window sills, and window wells/troughs is true.