Coal ash is a dangerous after-material from burning coal. It contains mercury, arsenic, lead and other toxic materials. Often coal ash gets inappropriately dumped into water ponds specifically made for dumping the ash. But this can pose problems for nearby communities if the ash soaks into the water stream or the soil. Coal ash is also sometimes used in concrete. If the concrete breaks down then it poses health hazards to the people in the buildings the concrete was use for.
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