Coal’s fly ash contains lots of poison substances, and they affect not only human bodies, but also the natural creatures. A scientist concludes that after burning coal, its flying ash has mercury, arsenic, lead, thallium, and many other poisons (Carlson 2010). Mercury is a chemical element that is called liquid metal. It is well known as its toxicity. There are news about people had mercury by mistake and they went into hospital. Arsenic is another chemical element, common poison, and it is dangerous. Arsenic as one of the elements in groundwater threatens human’s living. All these substances have effects on lung diseases like phthisis, asthma, and bronchitis. And all these diseases will eventually develop to lung cancer if patients stay in
