Another common contaminant in older homes is lead, a toxic metal that was once widely used in paints. If you live in a home painted before 1978, chances are good that there's lead in the paint on your walls or lurking a few coats beneath. Lead poses particular danger for children, who may ingest chips of flaking paint and dust from window frames or door moldings. Lead poisoning can lead to developmental delays, learning disabilities, and harm to the nervous system, so it's imperative to eliminate the contamination from your home and choose lead-free materials going forward. If you suspect that it's present on your walls, Have a professional check for lead. Lead removal, however, should be handled by a trained professional.
Lead is not only in older homes it can be in yard soil, playgrounds, household dust, toys, furniture and drinking water. For more information on lead and How to Make Your Home Lead-Safe from the epa just click this link,