Residential areas in San Antonio, Texas, and Baltimore, Maryland, were chosen for the study (Andra et al. 2006). Baltimore, Maryland, has a long history of lead poisoning. Over 449,000 houses in Maryland were built before 1950, and 972,000 were built before the lead band in 1978, making these houses potential sites for high-risk lead poisoning. Baltimore, Maryland, had one of the highest lead poisoning rates at one point but has since developed prevention programs (Maryland). In San Antonio, Texas, over 340,532 houses were built prior to the paint ban (Andra et al. 2006).
Andra, S., D. Sarkar, R. Datta, and S. Saminathan. 2006. Lead in Soils in Paint Contaminated Residential Sites at San Antonio, Texas, and Baltimore, Maryland. Environmental contamination and toxicology.
Maryland. 2006. Making Lead Poisoning History.
https://mde.maryland.gov/programs/ResearchCenter/eMDE/Pages/vol2no6/lead.aspx