Chinese chemical threat to rivers – BBC
Zhou Shengxian said the plants were surveyed after a chemical spill in November poisoned the water supply for millions of people in the north-east.
……He said that a total of 21,000 chemical factories had been found to be located along China’s rivers and coastline.
“Since the locations are quite a big problem, we need to take measures to avoid any future consequences of possible accidents,” he said.
More than half the plants were found to be located along two of China’s most important rivers, the Yangtze and Yellow rivers, which are relied upon by millions of people.