Jincheng is a prefecture-level city in the southeast of Shanxi province of north China. It is an industrial city in an area where coal mining is an important industry. It has a population of 2.2 million. A recent report issued by the State Environmental Protection Agency (SEPA) stated that 2/3 of Chinese cities were polluted. The article mentioned the effects of coal industries in the Shanxi Province where Jincheng is located.