India, Dec. 23 -- Data on water quality of the river Yamuna and of Delhi's sewage treatment plants (STPs), common effluent treatment plants (CETPs) and drains - mandated to be posted at least once a month - has not been updated for over three months.

The Delhi Pollution Control Committee (DPCC), mandated by the National Green Tribunal (NGT) to upload monthly reports, last shared water quality data for STPs, CETPs, and drains in September. The latest available report on the DPCC website for the Yamuna and major drains dates back to October.

Officials from the DPCC and the Delhi government did not respond to queries on whether sampling has been discontinued or why the data has not been published.

The absence of current data is particular...