Blood lead sampling has demonstrated an almost universal low-level elevation in inner-city children. The ingestion of lead paint chips is questioned as the main source of this exposure. Dust containing lead was found on the hands of inner-city children and interior household surfaces in substantially larger amounts than in similar suburban settings. It is possible that children may ingest this lead through typically frequent mouthing activity.
Sayre JW, Charney E, Vostal J, Pless IB. House and Hand Dust As a Potential Source of Childhood Lead Exposure. Am J Dis Child. 1974;127(2):167-170. doi:10.1001/archpedi.1974.02110210017002