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Jinchengis a prefecture-level city in the southeast of Shanxi province, China, bordering Henan province to the south and southeast. It is an industrial city in an area where coal mining is an important industry. The entire city has a population of 2.2 million. The presence of such a large coal industry has given Jincheng a reputation for air pollution and in recent years, the local government has invested heavily to promote better air quality in the city. This includes tree planting, establishin…