By Michael Bristow
BBC News, Kunming
China has begun an ambitious project to survey the country's major sources of pollution.
Factories, farms and other polluters will have to declare how much, and what kind of pollutants, they discharge.
The government admits it will be difficult to get companies to supply accurate data, so it is offering them immunity from fines and prosecution.
But even with this incentive, some say the system has flaws which will make it difficult to get accurate information.
Companies across the country are currently being asked to provide information for the China Pollution Source Census, which will be published next year.
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more:
http://news.bbc.co.uk/2/hi/asia-pacific/7269149.stm