New Delhi, June 27 -- Pollution levels in the Yamuna worsened further in May, with even the relatively cleaner upstream stretches of the river - from where Delhi draws its drinking water - breaching permissible pollution limits, according to the latest monthly water quality report prepared by the Delhi Pollution Control Committee (DPCC). The report showed that pollution indicators remained above prescribed standards across almost the entire river stretch in Delhi and many parameters deteriorated further compared to April, which had itself recorded poor water quality. Officials attributed the worsening conditions largely to declining river flows during the peak summer months. As the Yamuna enters its annual lean season, reduced environmental...