VELLORE: Collector C. Rajendran has directed officials of the Tamil Nadu Pollution Control Board (TNPCB) to immediately visit the places in the Ambur area where there were complaints of tanneries discharging untreated effluents into the Palar, and identify and close such tanneries.

He was presiding over a monthly agriculturists' grievance day meeting at the Collectorate here on Friday.