Greens have again locked horns with the State Pollution Control Board here over the alleged pollution of Periyar waters.

Environmentalists on Wednesday alleged that the board officials at the environment surveillance centre in Eloor failed to collect samples from near Edayar where discolouration of the river was reported on Tuesday. Purushan Eloor, spokesperson of the Periyar Malineekarana Virudha Samithi, said the board officials refused to collect the samples stating that there was only a patch of white discharge near the region close to Merchem company. We had alerted the board officials immediately after detecting the discolouration but they were late to reach the site, he said.