It's a huge problem -- the Times calls it a Hidden Scourge:
Here, Chinese leaders have acknowledged that lead contamination is a grave issue and have raised the priority of reducing heavy-metal pollution in the government’s latest five-year plan, presented in March. But despite efforts to step up enforcement, including suspending production last month at a number of battery factories, the government’s response remains faltering.
At a meeting last month of China’s State Council, after yet another disclosure of mass poisoning, Prime Minister Wen Jiabao scolded Environmental Minister Zhou Shengxian for the lack of progress, according to an individual with high-level government ties who spoke on the condition of anonymity.
The government has not ordered a nationwide survey of children’s blood lead levels, so the number of children who are at risk is purely a matter of guesswork. Mass poisonings like that at the Haijiu factory typically come to light only after suspicious parents seek hospital tests, then alert neighbors or co-workers to the alarming results.
And relevant to my current work, which I hope to write about more soon.