The U.S. Environmental Protection Agency has named 16 areas in 11 states that don't meet EPA standards for lead in the air.
Exposure to lead may impair a child's IQ, learning capabilities and behavior.
The 16 areas that don't meet the standards are:
Areas designated as not meeting the standard will need to develop and implement plans to reduce pollution by December 31, 2015, the EPA said.
National average concentrations of lead in the air have dropped almost 92 percent nationwide since 1980, largely the result of the elimination of lead in gasoline, according to the EPA. Lead in the air comes from such sources as smelters, iron and steel foundries and general aviation fuel.