In late March, Hindu worshippers in New Delhi, India bathed in the sacred Yamuna River for the festival of Chhath Puja. But the river was covered in toxic foam. While the Yamuna is among the most sacred rivers in India, it's also one of the most polluted in the world.
During the festival of Chhath Puja, Hindus pay tribute to the sun god Surya by bathing in the river Yamuna. The Yamuna is a tributary of the Ganges, another highly polluted river that is sacred in India.
