The issue was raised in the state Assembly by BJP MLA Shayamdev Roychaudhary who moved a resolution to immediately stop all drains falling in the river.
Referring to the bad condition of Ganga 'ghats' in Varanasi, Roychaudhary said Uttar Pradesh has the maximum course of the river. The state benefits the most from the river and because of this it also pollutes it the most, he said.
Making a special reference to the pollution caused by the leather units around Kanpur, the BJP member said the Pollution Control Board is "useless".
On this, Parliamentary Affairs Minister Azam Khan said the pollution in Ganga was as a serious challenge.
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Since the Central government appear to be serious in making it free of pollution, the state would lend its full cooperation in this task, he said.
Minister for Handicapped Welfare Ambika Chaudhary said industrial waste was the main cause of pollution in Ganga and the government ban it.
Prime Minister Narendra Modi, who won the Lok Sabha election from Varanasi, has promised to clean Ganga.