India, Oct. 22 -- A thick layer of toxic white froth has once again covered stretches of the Yamuna near Kalindi Kunj as falling temperatures and the churning of water falling from barrage intensify foaming on the river's surface.

With Chhath Puja less than a month away, the Delhi government agencies have started preparations for an anti-froth drive along the heavily polluted Kalindi Kunj-Okhla stretch, officials said.

The Aam Aadmi Party (AAP), however, has alleged irregularities in the tendering process for the deployment of an agency to spray the defoaming agent.

A senior government official said preparations for the anti-froth drive ahead of Chhath puja had begun. "Multiple agencies are being hired for procurement of chemicals to t...