The heavy metal contamination of urban soil in China is caused by industrial pollutant discharge, metal mining and smelting, family coal combustion, rubbish exudation and vehicle emission.

中国城市土壤重金属污染的主要来源是工业“三废”排放，金属采矿和冶炼，家庭燃煤，生活垃圾，汽车尾气排放。

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Europe and the United States for several hundred years of industrialization developed the pollution caused by long-term and paid a heavy price, land contamination as they face common problems.

欧美发达国家为其几百年工业化所造成的污染付出了长期而沉重的代价，土地污染成为他们共同面临的难题。

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Heavy metal contamination is extremely harmful in soil contamination. It is one of the research priorities in the world to control and remedy heavy metal contamination.

重金属污染是土壤污染中危害极大的一类，重金属污染的防治及其修复是目前国际上研究的热点之一。

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"The area is very big, very heavy contamination, lots of human resources are needed, definitely machinery is needed, " he said.

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Ultimately, the impact of this work will be to influence policy in order to treat heavy metal contamination and to optimise management policy for arsenic and nuclear legacy materials.

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Heavy-metal contamination in China's soil also includes high amounts of lead and arsenic.

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