sentences:  Pollution from metal smelters and a fast-growing battery industry has been responsible for most cases of, particularly high lead levels.In 2011, there were riots in the Zhejiang Haijiu Battery Factory from angry parents whose children received permanent neurological damage from lead poisoning.The central government has acknowledged the problem and has taken measures such as suspending battery factory production, but some see the response as inadequate and some local authorities have tried to silence criticisms.