Approximately how many children are at risk for lead poisoning due to exposure to potentially toxic levels of lead?

We do not have an exact number. In 1997, there were 900,000 children ages 1-5 that were identified as having dangerous blood lead levels, Due to the population growth since then, despite efforts to control lead exposures, I would estimate between 750,000 and 1 million children are at severe risk of lead poisoning.