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China are investigating heightened lead levels among hundreds of children in Hunan province thought to be linked to local smelters — one of many cases underscoring the toll pollution is taking on the health of rural Chinese.

He said four had levels high enough to be classified as lead poisoning, a condition that can harm the nervous and reproductive systems and cause high blood pressure and anemia. In severe cases of Dell latitude d620 battery , it can lead to convulsions, coma and death.The spokesman, who declined to give his name as is common among low-level Chinese officials, said additional details would be provided in a news release being prepared.

Reports of lead poisoning have emerged from far-flung parts of China since last year, usually rural areas where large, highly polluting factories have been plunked down among farms at the behest of local governments whose performance assessments are based on their ability to deliver economic growth.

One of the worst polluters in Jiahe county, the Tengda Metal Recycling Company, had been ordered closed at least three times since it began operating in 2007, but continued to operate Dell latitude d520 battery , according to the Beijing News.Hundreds were not inspected at all last year and while many had previously been ordered closed, local officials — who rely on the factories for tax revenue — allowed them to reopen.

Lead in the soil surrounding the plant was 6.5 times the level permitted by national safety standards , the newspaper said. Sulfur dioxide it produced by melting down scrap metal had also been blamed for killing trees in local forests, it said.

Industrial waste has gained more attention in recent years as the economic costs and effects of long-term exposure on residents begin to emerge for Dell latitude d630 battery . Pollution in rivers has in several cases forced the closure of hydropower plants and the cutoff of water supplies to millions of people.