Environment Minister Prakash Javadekar told PTI his ministry "concentrated" on 764 "grossly polluting" industries along the river and strict action, including closures as well, was taken against them.
He said a report regarding this has been submitted to the Prime Minister's Office (PMO) as well.
The Minister said effluent norms for distilleries and sugar factories were changed which is why 'black liquour' and 'spent wash' no longer flows in the Ganga and this helped bring down the pollution levels.
"So now black liquor is not going into the Ganga and spent wash is also not flowing into it. It's being used for manufacturing fertilisers. Pollution from other industries too have curtailed. We have taken action against more than 100 industrial units," the Minister added.
"All this has resulted in reduction nearly 30-35 percent pollution in Ganga from industrial activities," Javadekar said.
He said that for tanneries, the Common Affluent Treatment Plant scheme is being coordinated by Ministry of Water Resources and its impact will be visible within one year.
The Environment Ministry in January had ordered closure of 150 industrial units, including sugar mills and tanneries, along the river after they failed to install 24X7 effluent monitoring systems.
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