What’s common between the Yamuna river in Delhi, Bellandur lake in Bengaluru and Marina beach in Tamil Nadu- a thick carpet of foam.

Water bodies in India are under threat. This foam floating on the surface of the bodies has also been carried away to roads and residential areas by the winds. While it might seem like the clouds have come down to earth, it is actually hazardous and cause cancer.

What causes this foam formation and why is it so dangerous. Watch the story to know.