Latest environment reports show that there is basically no pollution of water or atmosphere in Tibet, says a white paper issued on Monday.

Tibet has basically maintained its original natural state and is globally one of the areas with the best environmental quality, says the white paper titled "Sixty Years Since Peaceful Liberation of Tibet", which was issued by the Information Office of the State Council.

The paper says that ecological conservation has been progressing rapidly and environmental protection is being strengthened in an all-round way in Tibet.

Since its peaceful liberation in 1951, and especially since the adoption of the reform and opening-up policies in late 1970s', the central and regional governments have attached great importance to ecological conservation and environmental protection in Tibet.

For instance, the forest coverage rate has risen from less than 1 percent before the peaceful liberation to 11.91 percent at present, and more than 6 million hectares of wetland have been protected, according to the white paper.