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People collect water at a tube well in Islamabad, Pakistan, Wednesday, Aug. 23, 2017. A new study suggests some 50 million Pakistanis could be at risk of drinking arsenic-tainted groundwater. The findings are based on a hazard map built using water quality data from 1,200 tube wells in the densely populated Indus Valley. (AP Photo/B.K. Bangash)

People collect water at a tube well in Islamabad, Pakistan, Wednesday, Aug. 23, 2017. A new study suggests some 50 million Pakistanis could be at risk of drinking arsenic-tainted groundwater. The findings are based on a hazard map built using water quality data from 1,200 tube wells in the densely populated Indus Valley. (AP Photo/B.K. Bangash)

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