The National Green Tribunal, NGT has directed the Delhi government to decide in a week whether steel pickling units fall under the prohibited list of industrial activity as per norms set by the Central Pollution Control Board. <br/><br/>A bench headed by acting chairperson Justice U D Salvi warned that in case of non-compliance with the order by the authorities, it would order closure of the steel pickling units.<br/><br/>The NGT was hearing a plea filed by an NGO seeking execution of its order by which the green panel had directed the Delhi Pollution Control Committee to take action against stainless steel pickling industries. <br/><br/>The plea alleged that steel pickling units functioning at Wazirpur discharge effluent in open drains which ultimately meet the Yamuna river.