New Delhi, Nov. 3 -- With another bout of froth formation reported in the Yamuna over the past few days, the Delhi government has resumed sprinkling defoaming agents in the river near Kalindi Kunj ahead of Chhath Puja, continuing an annual practice that experts stressed addresses only the symptoms of a much deeper pollution problem.

To find a lasting solution to the toxic foam in this stretch - an issue that triggers a political showdown every year before the festival - the Delhi government has commissioned a structural feasibility study of the Okhla barrage by the Irrigation Research Institute (IRI), Roorkee.

The government has entrusted the work to Uttar Pradesh's irrigation and water resources department, providing it Rs.91 lakh to e...