The national green tribunal bench in Calcutta on Monday directed the high court registrar-general to send it the files of a case related to night pollution in the city at the earliest. The eastern zonal bench of the tribunal wants the files so that it can take up the case filed by an environment activist in 2009. "Considering the importance of the issue, the registrar-general should send the files related to a case on the city's night pollution as immediately as possible," the tribunal consisting of Justice P.K. Roy, a former judge of Calcutta High Court, and P.C. Mishra, said in a suo motu order. An order of the national green tribunal can only be challenged in the Supreme Court. The eastern bench of the tribunal adjudicates on cases related to "environment, forest and bio-diversity" in eastern and north-eastern India. The bench on Monday also directed the state transport department to file an affidavit with details about traffic movement in the city at night and asked the state pollution control board to mention within two weeks the level of air pollution at night. Environment activist Subhas Dutta had moved the tribunal saying the high court had not sent files related to some important environment matters to the eastern bench of the green tribunal despite assurances by the chief justice. "I had produced records in the high court showing that the level of air pollution in the city at night is five times higher than that prevalent during the day. I also informed the court that trucks and heavy vehicles, entering the city after 8pm from other states, cause air pollution at night. On the basis of my prayer, the high court had asked the government to use automatic remote sensing devices to measure pollution caused by trucks and other vehicles," Dutta said. In 2009, the state government had bought a remote sensing device. But after realising the need for more such devices, the court had in 2010 asked the government to buy three more. "But till date neither have the devices been bought nor has the case come up for hearing before the high court division bench," said Dutta. After the green tribunal was set up in the city in September, Dutta had requested the chief justice to send nine long-pending environment cases to the tribunal. "The chief justice had assured me that the cases would be sent to the tribunal soon. But till date the cases have not been sent to the tribunal and the only remote sensing device in the city is lying defunct. The level of air pollution has reached an alarming level," Dutta said.