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The Yamuna is one of India’s many sacred rivers and people make long journeys to drink and bathe in its waters. While this is considered spiritually purifying, it’s causing serious harm to many as the Yamuna is considered to be one of the most polluted rivers in the world. Huge billowing clouds of toxic foam have formed in the most contaminated areas, like here in New Delhi, created by dangerous chemicals discharged into the river from factories.