To make monitoring of effluent discharge by dyeing units in Tirupur and Erode districts more effective, the Tamil Nadu Pollution Control Board (TNPCB) will have an online water quality monitoring system this year in the Noyyal river and Kalingarayan canal.

In the policy note tabled in the Assembly on Tuesday, Environment Minister B.V. Ramanaa said the process of procurement of instruments for continuous online monitoring of water quality in Noyyal river and Kalingarayan canal will be completed by May 31.