Bangladesh is the fourth most-seriously hit in terms of the number of children affected as lead poisoning is affecting them on a massive and previously unknown scale in the world, says a new global report. The report, the first of its kind, says that around 1 in 3 children – up to 800 million globally – have blood lead levels at or above 5 micrograms per deciliter (µg/dL), the level at which requires action. Nearly half of these children live in South Asia.