Hindu devotees perform rituals during the Chhath Puja festival on the banks of the Yamuna River covered in chemical foam caused due to industrial and domestic pollution in New Delhi, India on Wednesday, Nov. 10.

Devotees stood knee-deep in frothy, toxic waters, sometimes even immersing themselves in the river for a holy dip to mark the festival.

Hindu devotees perform rituals on the banks of river Yamuna covered by chemical foam caused due to industrial and domestic pollution, during Chhath Puja festival in New Delhi, India, Wednesday, Nov. 10, 2021. A vast stretch of one of India's most sacred rivers, Yamuna, is covered with toxic foam, caused partly by high pollutants discharged from industries. Yet hundreds of Hindu devotees Wednesday stood knee-deep in its frothy, toxic waters, sometimes even immersing themselves in the river for a holy dip, to mark the festival of Chhath Puja.