Some Chinese regions near key waterways the Yangtze and Yellow rivers are “seriously lagging” state water quality standards despite big improvements overall this year, the environment ministry said.China divides its water resources into six grades, with the top three considered safe for human use, and the lowest, “below grade V”, unfit even for industrial or irrigation purposes.Some 75.4 per cent of China’s water was judged to be in the top three grades in the first 10 months of this year, up 2…


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