Toxic foam covers the surface of the Yamuna River in New Delhi on Friday (November 9). <br /><br />Authorities in the Indian capital have struggled to cope with extreme pollution in recent weeks.<br /><br />Writes the filmer: "The images appear to show a snow-covered river. The reality is that stretches of one of India’s most sacred rivers, the Yamuna, are covered with toxic foam caused by industrial waste. <br /><br />"The situation has become so grave that not only the air [but] even the water bodies situated in Delhi such as the Yamuna River near the Kalindi Kunj area have become completely toxic.<br /><br />"Recently, scores of helpless devotees on the occasion of [Hindu festival] Chhath Puja were forced to offer prayers to the sun god by immersing themselves in the toxic foam present inside the river Yamuna during the four-day long festival."