The Supreme Court today sought to know the level of pollution in the river Yamuna and directed the Central Pollution Control Board to file a report within two weeks after examining the sample of its water.A three Judge bench headed by the Chief Justice S H Kapadia asked the pollution board to take three water samples near sewerage plant and file the report on pollution level.The Court passed the order in a case which it had taken suo-moto cognizance in December 1994 on the basis of news report on the level of pollution in Yamuna.The apex court since then has been monitoring the cleaning of Yamuna.