How about you talk to some stats -
https://cpcb.nic.in/wqm/pollution-assessment-ganga-2013.pdf
https://www.sciencedirect.com/science/article/pii/S2589004221000900#!
Untreated sewage (not untreated industrial disposal) that is the biggest source of pollution.
Industrial waste is the second biggest cause of pollution.
Organic waste from other sources contributes the 3rd largest which includes religious waste, domestic use chemicals like Shampoos and cleaners or pesticide/fertilizer runoff from farmlands.
"Its purely untreated Industrial disposal, sewage disposal, tanneries, slaughterhouses, hospitals, distilleries, and chemical plants disposal"🤡
"Kumbh mela at its peak has 200Million"🤡
Yes, my man just casually scoffing at 200 million people coming to bathe in a river/throw stuff into it. 200 million people is a huuuuuuuuuuuuuge number my friend. That's around the population of Indonesia that has the one of the worst polluted rivers in the world.
A discharge of 40K m3/s is impressive but you severely underestimate the effects of a huge population. Only 8 billion tiny humans are sufficient to change the climate of an entire planet.