In Chicago, children are most likely to be exposed to lead while living or staying in older homes or apartments that have lead paint. Most homes built before 1978 (when lead paint was banned in the U.S.) have some lead paint on the inside and outside of the building. When old paint cracks and peels, it makes lead dust. Lead dust is so small you cannot see it or smell it. Children may get lead poisoning from swallowing or breathing in lead dust on their hands and toys.