India, Nov. 7 -- The National Green Tribunal (NGT) on November 3, 2025, directed the Union Ministry of Environment, Forest and Climate Change and the Union Ministry of Housing and Urban Affairs to submit a report on the issue of pollution caused by colonies on 'O' zone making Yamuna water toxic.

There is discharge of untreated sewage from these colonies which affects the water quality of the Yamuna, the court noted.

The O zone comprises the entire floodplain along the 22-km stretch of the Yamuna in the city, according to the Master Plan Delhi 2021. No construction is allowed in the area and ownership of property in the zone is not permitted.

The affidavit filed by the Delhi Development Authority (DDA) on October 31, 2025, stated that t...