Arsenic
Natural arsenic pollution affects 21 countries across the world sometimes reaching a concentration more than ten times the WHO guidelines. | Arsenic is now recognised to be one of the world's greatest environmental hazards, threatening the lives of several hundred million people. | It is colourless and odourless and consequently, people use it instead of more obviously polluted surface water. | Naturally occurring arsenic leaches into water from surrounding rocks and once in the water supply it is both toxic and carcinogenic to anyone drinking it.
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