Lead in dust results from indoor sources such as:
Exposure to lead dust is common when old buildings are demolished. Even in well-maintained buildings, lead dust can form when lead-based paint is scraped, sanded or heated during home repair activities. Lead paint chips and dust can get on surfaces and objects that people touch. Settled lead dust can re-enter the air when the building is vacuumed or swept, or people walk through it.
To reduce exposure to lead dust, it is especially important to maintain all painted surfaces in good condition, and to clean frequently, to reduce the likelihood of chips and dust forming. Using a lead-safe certified renovator to perform renovation, repair and painting jobs is a good way to reduce the likelihood of contaminating your home with lead-based paint dust.