I would like to write a paper on why there is a high amount of lead poisoning in Baltimore, Md?

Yes, lead exposure has a high correlation with race and socioeconomic status. I remember hearing of a study that took place in Baltimore many years ago. The experimentors were aware that there was lead in the apartments of some of the children- and followed them over time to see the effects. Obviously, this was a serious violation of ethics. You might try googling something like that. If you have access to a university periodical search engine, do some searches for "lead" and "baltimore".