News > Explained: What causes frothing in Delhi’s Yamuna?

Explained: What causes frothing in Delhi’s Yamuna?

In what has become a repeat occurrence in the city, a layer of froth was seen floating over parts of the Yamuna river near Kalindi Kunj on Monday, with Chhath devotees standing in toxic foam-laden water to offer prayers. What causes frothing in the Yamuna? 

Experts say the release of untreated or poorly treated effluents, including sewage from those parts of the city that are not connected to the sewerage network and industrial waste, could lead to frothing.