Earlier, TNPCB had, on May 29, ordered closure of the Sterlite plant on complaints it was emitting toxic sulphur dioxide. The green panel then set aside the order of TNPCB and allowed Sterlite Industries Ltd to restart its copper smelting unit.
It had also ordered constitution of a four-member panel, comprising Member Secretary of Central Pollution Control Board, a member or engineer from TNPCB and two members of IIT-Madras to supervise the plant.
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The tribunal had said the closure order was passed by TNPCB in an "abrupt manner" based on "mere apprehension" of leakage of gas, without any scientific data to support the same.
Besides seeking quashing of the NGT's order, TNPCB has challenged its jurisdiction to hear Sterlite 's plea. TNPCB had defended its order and maintained that the plant emits toxic gases and complaints against it were genuine.