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"Nearly 20 million people in China live in areas at high risk of arsenic contamination in their water supplies, according to a study published on Thursday. The Chinese government has labelled arsenic contamination, which it first diagnosed in China in the 1970s, as one of the country's "most important endemic diseases," due to the chronic side effects which include cancers, diabetes and cardiovascular diseases. China has been undertaking time-consuming testing of wells but the process could take decades to complete, prompting the researchers of the new study to produce a computer model able to predict which areas would be most likely at risk."

Nearly 20 million people in China could be exposed to water contaminated with arsenic, a study suggests. Scientists used information about the geology of the country to predict the areas most likely to be affected by the poison.