New Delhi, Oct. 17 -- Chief minister Rekha Gupta on Thursday inspected the Yamuna riverbank at Kalindi Kunj to review ongoing clean-up efforts and water quality ahead of Chhath Puja, even as the Bharatiya Janata Party (BJP) and the Aam Aadmi Party (AAP) traded barbs over the use of defoaming chemicals.

At the inspection, Gupta said that, for the first time in recent years, there was no froth visible on the river's surface, crediting the improvement to the Delhi Jal Board (DJB)'s sustained desilting and pollution control measures.

During the visit, she examined real-time water quality data at the on-site laboratory set up by the DJB's treatment plant and quality control wing and expressed satisfaction with the readings.

"The dissolved o...