A Hindu devotee performs rituals in Yamuna River, covered by a chemical foam caused by industrial and domestic pollution, during the Chhath Puja festival in New Delhi, India, Wednesday, Nov. 10, 2021. A vast stretch of one of India's most sacred rivers, the Yamuna, is covered with toxic foam, caused partly by high pollutants discharged from industries ringing the capital New Delhi. Still, 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. (AP Photo/Altaf Qadri)