'During the operation of the plant, the sulphur dioxide (SO2) level of the air had gone up by just 1 micron per cubic meter at various sites,' says a study
The case has been registered against unidentified officials of police and revenue department on the basis of a complaint from K Arjunan, District Secretary, CPI-M
The Tamil Nadu government had ordered the pollution board to seal and "permanently" close the group's copper plant following violent protests over pollution concerns