Chief Justice of India, Altamas Kabir today expressed concern over the persisting smog cover over Delhi and hinted that the courts may look into the matter soon. He made the observations while hearing a case on disposal of the Bhopal gas tragedy waste at the Union Carbide plant. Delhi has remained under the grip of dense smog for almost a week. According to scientists at the Indian Institute of Tropical Meteorology, Pune, the problem has been caused due to an alarming increase in the number of vehicles in the national capital.