Nearly 90% of Bangladeshis use groundwater Up to 77 million people in Bangladesh have been exposed to toxic levels of arsenic from drinking water in recent decades, according to a Lancet study.
The research assessed nearly 12,000 people in a district of the capital Dhaka for over a period of 10 years.
More than 20% of deaths among those assessed were caused by the naturally occurring poisonous element, it found.
The World Health Organization said the exposure was "the largest mass poisoning of a population in history".
It began after hand-pumped wells were installed in the 1970s to tap groundwater.
Scientists say even small amounts of arsenic over a long period can cause cancer of the bladder, kidney, lung or skin.
Bangladesh was chosen for the study because nearly 90% of the population uses groundwater as its primary source of fresh water.
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