Nearly 1,000 children living in a major Chinese lead smelting base have excessive levels of the heavy metal in their blood, state media said on Tuesday, as environmentalists called on firms to detail their pollution. The country's biggest smelter has acknowledged some responsibility in the poisoning in central Henan province..., the official Xinhua agency said. "We do bear responsibility for the pollution," Xinhua quoted Yang Anguo, board chairman of Yuguang Gold and Lead as saying. "Some pollution has accumulated over the past 20 years or more and the plant is too near homes."... The city government has suspended production at 32 of the 35 lead plants, and on the most polluting production lines at the three major plants [Henan Yuguang, Wanyang Smeltery Group, Jinli Smelting], Xinhua said. Environmental campaign group Greenpeace on Tuesday slammed 18 major Chinese and international companies for failing to publish their pollution levels, in violation of environmental laws.