New Delhi, July 21 -- The relatively cleaner stretch of the Yamuna between Palla and Wazirabad, which has no major drains and sewage outfalls, has deteriorated with dissolved oxygen (DO) levels-which support aquatic life-falling by an average of 30-40%, according to Delhi Pollution Control Committee's latest water quality report. The 21-km stretch was considered the cleanest part of the severely polluted river in Delhi.P4
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