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The researchers identified eight environmental variables that can predict whether a region창��혲s groundwater will have high arsenic concentrations. For example, arsenic contamination tends to happen in wet areas with salty soil and sediments younger than about 12,000 years. After using these and other factors to map the arsenic risk in China, the researchers matched it with population data to estimate that roughly 19.6 million Chinese people live near contaminated groundwater. |
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