"Before children even take their first breath, common air pollutants breathed by their mothers during pregnancy may reduce their intelligence." Scientific America reports on urban pollution: "The link between prenatal exposure to pollutants and cognitive development is a growing area of concern 'that's been getting a lot more attention,' said David Bellinger, an environmental epidemiologist and professor of neurology at Harvard Medical School. ... Researchers have now linked several environmental contaminants to effects on developing brains."