"Alarming levels of brain-damaging lead are poisoning more than a fifth of the children tested from some of the poorest parts of Chicago, even as the hazard has been largely eliminated in more prosperous neighborhoods, a Tribune investigation has found.

The toxic legacy of lead — added to paint and gasoline for nearly a century — once threatened kids throughout the nation's third largest city. As Chicago's overall rate of lead poisoning steadily dropped during the past two decades, the disparities between rich and poor grew wider.

Some census tracts, smaller geographic areas within neighborhoods, haven't seen a case of lead poisoning in years. But children ages 5 and younger continue to be harmed at rates up to six times the city average in corners of predominantly African-American neighborhoods ravaged by extreme poverty, chronic violence and struggling schools, according to a Tribune analysis of city records."

Michael Hawthorne reports for the Chicago Tribune May 1, 2015. [2]