"Close to 1,000 firms across the state have been issued notices during he last few days.
"The action is being taken in accordance with a recent judgement of National Green Tribunal," D N Pandey, Member Secretary of the Board, said today.
The ruling is related with action against the units which have no permission to operate.
"Though we have been issuing notices against such firms but after the ruling, officers have been directed to review the current situation and issue notices accordingly," he said.