Flint, Mich., isn't the only American city with a lead problem. Though the health crisis in Flint has highlighted the use of lead in water pipes, author David Rosner tells Fresh Air's Terry Gross that lead, which is a neurotoxin, can be found throughout the U.S. on walls, in soil and in the air.
"The problem with lead is that it's now really everywhere, and we've created a terribly toxic environment in all sorts of ways," he says.