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In this Saturday, November 2, 2019, file photo, an Indian Hindu devotee performs rituals in the Yamuna river, covered with chemical foam caused by industrial and domestic pollution, during Chhath Puja festival in New Delhi, India. Schools have reopened in the Indian capital with toxic air level coming down by more than half since authorities declared a health emergency last Friday. Authorities are tackling a large amount of toxic foam floating in the Yamuna River, caused partly by high ammonia levels emanating from industrial pollutants. (Photo by Altaf Qadri/AP Photo/File)
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