On World Environment Day, here’s a look at the effects of lead toxicity in soil and water on children.

Data from a study by the Blacksmith Institute has found that 189,725 children in seven Asian countries, including India, Bangladesh and Pakistan, are at risk of diminished intelligence because of being exposed to increased levels of lead in water and soil at hazardous waste sites.

Of these, 50,084 children are Indian. The other countries studied were Indonesia, Kazakhstan, the Philippines and Thailand. The decrease in the intelligence quotient ranged from 4.94 to 14.96 points.