The world's largest polluter, China, is reported to have come up with its first national pollution census. The first of its kind in China, the census has mapped more than five-million sources of industrial, residential and agricultural waste throughout the country. However, the country has not made its report public.

In a news conference, Chinese vice minister of environmental protection, Zhang Lijun, said that possibility of an environment tax is being studies by various ministries.

As of now only the government and relevant ministries have access to the pollution census. The minister, however, informed that the census will be released in the future.

Describing the step as 'incredible' Deborah Seligsohn, principal adviser for the World Resources Institute on China's climate and energy issues said, "In terms of giving them an excellent basis for being able to manage and track what they're doing, it's a huge step forward".

The survey puts China ahead of other developing countries in having a detailed map of who is polluting and where.

The census, which took two-years coupled with 57,000 staff to complete, also includes agriculture pollution in China.

''We urge the government to immediately establish a strong platform through which the public could easily access a wide range of pollution data,'' Sze Pang Cheung, campaign director for Greenpeace China, said in a statement.