New Delhi, May 26 -- Delhi's environment and industries minister Manjinder Singh Sirsa on Monday visited the Okhla industrial area and inspected the common effluent treatment plants (CETPs) to assess their efficacy.

He later said the National Environmental Engineering Research Institute (NEERI) was in the process of carrying out a detailed survey to assess the functioning of the CETPs.

The minister's inspection is part of a broader set of measures being implemented by the Delhi government to make the Yamuna pollution-free. Sirsa also reviewed parameters such as biological oxygen demand (BOD) levels, treatment flow capacities and the overall operational efficiency of the facilities.

"We are actively working on decentralising STPs and CE...